README

TalerPHP is a PHP SDK for interacting with GNU Taler payment systems. It provides a simple, secure way to integrate Taler payments into your PHP applications and services.

⚠️ Early Development Notice

TalerPHP is currently in early development. The API and features are subject to change, and the package is not yet ready for production use. We welcome feedback and contributions, but please use with caution and do not rely on this package for critical or production systems at this stage

Features

Easy API for interacting with Taler services
PSR-4 autoloading
Extensible and testable architecture

Prerequisites

Before you begin, ensure you have met the following requirements:

PHP 8.1 or newer
Composer
(Optional) PHPUnit for running tests

Supported Taler protocol versions

Supported Taler protocol versions: v12-v20

Installation

Install TalerPHP via Composer:

composer require mirrorps/taler-php

Requirements

• A PSR-18 HTTP client implementation (e.g., Guzzle, Symfony HttpClient)
• A PSR-17 HTTP factory implementation (e.g., Nyholm/psr7, guzzlehttp/psr7 version 2 or higher)
• Optional: For async request support, you need a client that implements the `HttpAsyncClient` interface from `php-http/httplug`

Usage

require "vendor/autoload.php";
use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

Factory-managed authentication (no pre-existing token)

You can let the SDK obtain and manage the access token for you by providing credentials and the target instance. The SDK will:

Request an access token using Basic auth
Store the resulting Authorization header value internally
Refresh the token automatically before it expires when sending requests

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'username' => 'merchant-user',
    'password' => 'merchant-pass',
    'instance' => 'shop-1',         // instance ID
    // optional (defaults shown):
    'scope' => 'readonly',          // "readonly"|"write"|"all"|"order-simple"|"order-pos"|"order-mgmt"|"order-full"
    'duration_us' => 3600_000_000,  // token validity upper bound in microseconds or "forever"
    'description' => 'Backoffice session'
]);

// Use the client as usual; the SDK injects/refreshes the Authorization token automatically.
$orders = $taler->order()->getOrders(['limit' => '-20']);

Retrieve and persist the managed token

After creation, you can read the in-memory token from the client’s config and save it for reuse:

// Extract the token and its expiry from the managed-auth client
$token = $taler->getConfig()->getAuthToken();                // e.g., "Bearer abc..."
$expiresAt = $taler->getConfig()->getAuthTokenExpiresAtTs(); // int|null (seconds)

// Persist to your storage (DB/Secrets Manager/etc.)
saveTokenSomewhere($token, $expiresAt);

Later, restore the client with the saved token:

$taler = \Taler\Factory\Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => $tokenFromStorage // already includes the "Bearer " prefix
]);

Note: The token string already includes the required “Bearer ” prefix; store and reuse it as-is. Notes:

If token is provided, it takes precedence and credentials are ignored.
The password is only used to acquire a token; the SDK stores the resulting access token and its expiry metadata for refresh.

Configuration

base_url: The URL of your Taler backend instance.
token: Your authentication token ( ⚠️ do not hardcode; use environment variables or secure storage in your application).
username (optional): Merchant instance username for Factory-managed authentication.
password (optional): Merchant instance password for Factory-managed authentication.
instance (optional): Target instance ID to authenticate against when using credentials.
scope (optional): Desired token scope when using credentials. One of "readonly"|"write"|"all"|"order-simple"|"order-pos"|"order-mgmt"|"order-full". Defaults to "readonly".
duration_us (optional): Upper bound on token validity as microseconds (int) or "forever". The server may override. Defaults to SDK/server defaults.
description (optional): Human-readable description attached to the issued token.
wrapResponse: (Optional) Boolean flag to control DTO wrapping of responses. Defaults to true. When set to false, methods return raw array responses from Taler.
httpClient: (Optional) A PSR-18 compatible HTTP client instance.
logger: (Optional) A PSR-3 compatible logger. If omitted, the SDK performs no logging.
debugLoggingEnabled: (Optional) Boolean flag to enable SDK DEBUG logging. Defaults to false. When false, the SDK skips all debug logging work (zero overhead).

Basic Example

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token',
    'wrapResponse' => true // Optional, defaults to true
]);

Using Custom HTTP Client

If the SDK's auto-discovery doesn't find a PSR-18 compatible HTTP client, or if you want to use a specific client implementation, you can provide your own. Here's an example using Guzzle:

use Http\Adapter\Guzzle7\Client as GuzzleAdapter;

// Create PSR-18 client using Guzzle
$httpClient = GuzzleAdapter::createWithConfig([
    // Strongly recommended: always set sane timeouts
    // Overall request timeout (seconds)
    'timeout' => 10.0,
    // Connection establishment timeout (seconds)
    'connect_timeout' => 5.0,

    // Redirect policy: prevent protocol downgrade and limit hops
    'allow_redirects' => [
        'max' => 3,                 // limit redirect chain length
        'protocols' => ['https'],   // disallow downgrade to http
        'referer' => false
    ],
]);

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token',
    'client' => $httpClient
]);

Security: Timeouts and Redirect Policies (Important)

Request timeouts (HIGH):
- Always inject a PSR-18 client configured with explicit timeouts. Without timeouts, network calls may hang indefinitely under network partitions or server issues, causing thread/worker exhaustion and cascading failures.
- At minimum set both a connection timeout and a total request timeout. Example with Guzzle adapter above uses connect_timeout and timeout.
Redirect handling (MEDIUM):
- Enforce an upper bound on redirect chains to avoid redirect loops and reduce SSRF blast radius. Example above uses allow_redirects.max.
- Disallow protocol downgrades to http by restricting allow_redirects.protocols to ['https']. This prevents leaking credentials or tokens over plaintext during redirects.

Notes:

PSR-18 does not define a standard for these options; use your chosen client's native configuration (e.g., Guzzle options). When using other clients, consult their documentation to apply equivalent settings (timeouts and redirect limits/HTTPS-only redirects).

Backend validation and protocol versioning

When you create a Taler instance via the Factory, the SDK proactively validates that your backend is a Merchant backend and performs a protocol version compatibility check:

Merchant backend check (fail-fast): The Factory calls GET /config and validates name === "taler-merchant". If not, it throws InvalidArgumentException during creation.
Protocol version triplet parsing: The SDK parses the version string current:revision:age from /config and compares it against the SDK's client current version (Taler::TALER_PROTOCOL_VERSION, currently 20).
- Compatibility rule: clientCurrent must be within [serverCurrent - serverAge, serverCurrent].
- If out of range, the SDK logs a WARNING via your PSR-3 logger (if provided) to help you detect potential incompatibilities early. Example log message includes server version and the supported range.

Optional helpers for custom checks:

use function Taler\Helpers\parseLibtoolVersion;      // returns [current, revision, age] or null
use function Taler\Helpers\isProtocolCompatible;      // boolean

$parsed = parseLibtoolVersion('20:0:8'); // [20, 0, 8]
[$serverCurrent, , $serverAge] = $parsed;
$ok = isProtocolCompatible($serverCurrent, $serverAge, (int) Taler::TALER_PROTOCOL_VERSION);

Notes:

To receive the WARNING log, pass a PSR-3 logger to the Factory.
This check is non-fatal (only logs) as long as the backend name is valid; the exception is thrown only when the backend is not a merchant backend.

Payment processing (Order API)

https://docs.taler.net/core/api-merchant.html#payment-processing

The Order API provides functionality to interact with Taler order services. Here's how to use it:

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$orderClient = $taler->order();

Available Methods

Create Order

Create a new order using either a fixed-amount contract (OrderV0) or a choice-based contract (OrderV1). The call returns a PostOrderResponse with the generated order_id.

Minimal example with OrderV0 (fixed amount):

use Taler\Api\Order\Dto\OrderV0;
use Taler\Api\Order\Dto\PostOrderRequest;

$order = new OrderV0(
    summary: 'Coffee Beans 1kg',
    amount: 'EUR:12.50'
);

$request = new PostOrderRequest(order: $order);

// Create the order 
$result = $orderClient->createOrder($request);

// Access response
echo $result->order_id; // e.g., "order_123"

Example with OrderV1 (choices):

use Taler\Api\Order\Dto\OrderV1;
use Taler\Api\Order\Dto\OrderChoice;
use Taler\Api\Order\Dto\PostOrderRequest;

$order = new OrderV1(
    summary: 'Monthly Subscription',
    choices: [
        new OrderChoice(amount: 'EUR:9.99')
    ]
);

$request = new PostOrderRequest(
    order: $order,
);

$result = $orderClient->createOrder($request);

echo $result->order_id;

Handle errors for Create Order

When creating an order, the backend may return non-200 status codes for normal error conditions. The SDK throws typed exceptions to help you handle these cases with structured DTOs:

use Taler\Api\Order\Dto\OrderV0;
use Taler\Api\Order\Dto\PostOrderRequest;
use Taler\Exception\OutOfStockException;              // HTTP 410
use Taler\Exception\PaymentDeniedLegallyException;    // HTTP 451
use Taler\Exception\TalerException;

$order = new OrderV0(
    summary: 'Coffee Beans 1kg',
    amount: 'EUR:12.50'
);

$request = new PostOrderRequest(order: $order);

try {
    $response = $orderClient->createOrder($request);
    // $response is PostOrderResponse on success
    echo $response->order_id . "\n";
} catch (OutOfStockException $e) { //--- http status code 410 Gone
    $dto = $e->getResponseDTO();
    if ($dto !== null) {
        // Access structured out-of-stock details
        // $dto->product_id (string)
        // $dto->requested_quantity (int)
        // $dto->available_quantity (int)
        // $dto->restock_expected?->t_s (int|string)
    }
    // Recover: show alternative products, adjust quantity, etc.

} catch (PaymentDeniedLegallyException $e) {  //--- http status code 451 Unavailable For Legal Reasons
    $dto = $e->getResponseDTO();
    if ($dto !== null) {
        // Exchanges that denied payment
        // $dto->exchange_base_urls is array<int, string>
    }
    // Recover: refresh coins from these exchanges or retry with others
} catch (TalerException $e) {
    // Other Taler API errors (e.g., 404/409). Inspect structured error details:
    // $error = $e->getResponseDTO(); // instance of Taler\Api\Dto\ErrorDetail or null
    // Or raw array JSON if preferred: $e->getResponseJson();
    throw $e;
} catch (\Throwable $e) {
    // Transport/runtime errors
    throw $e;
}

With custom headers or raw array response:

// Custom headers
$result = $orderClient->createOrder($request, [
    'X-Custom-Header' => 'value'
]);

// Disable DTO wrapping to get raw array
$result = $taler->config(['wrapResponse' => false])
    ->order()
    ->createOrder($request);

Get Order Status

Retrieve the status and details of a specific order:

// Get order by ID
$order = $orderClient->getOrder('order_123');

// The response type depends on the order status:
if ($order instanceof CheckPaymentPaidResponse) {
    // Order is paid
    echo $order->order_status;        // "paid"
    echo $order->deposit_total;       // Total amount deposited
    echo $order->refunded;            // Whether order was refunded
    echo $order->refund_pending;      // Whether refund is pending
    echo $order->wired;               // Whether funds were wired
    echo $order->refund_amount;       // Total refunded amount
    
    // Access contract terms
    $terms = $order->contract_terms;
    echo $terms->summary;             // Order summary
    echo $terms->order_id;            // Order ID
    
    // Access last payment timestamp
    echo $order->last_payment->t_s;   // Unix timestamp
} 

if ($order instanceof CheckPaymentClaimedResponse) {
    // Order is claimed but not paid
    echo $order->order_status;        // "claimed"
    echo $order->order_status_url;    // Status URL for browser/wallet
    
    // Contract terms
    $terms = $order->contract_terms;
    echo $terms->summary;             // Order summary
    echo $terms->order_id;            // Order ID
}

if ($order instanceof CheckPaymentUnpaidResponse) {
    // Order is neither claimed nor paid
    echo $order->order_status;        // "unpaid"
    echo $order->taler_pay_uri;       // URI for wallet to process payment
    echo $order->summary;             // Order summary
    echo $order->total_amount;        // Total amount to pay (may be null for v1)
    echo $order->order_status_url;    // Status URL for browser/wallet
    
    // Access creation timestamp
    echo $order->creation_time->t_s;  // Unix timestamp
}

// Get order with additional parameters
$order = $orderClient->getOrder('order_123', [
    'session_id' => 'session_xyz'     // Optional session ID
]);

// Get order with custom headers
$order = $orderClient->getOrder(
    orderId: 'order_123', 
    headers:[
        'X-Custom-Header' => 'value'
    ]
);

Get Orders History

Retrieve the order history with optional filtering:

// Get orders (default limit: 20 asc)
$orders = $orderClient->getOrders();

// Get orders with filters
$orders = $orderClient->getOrders([
    'limit' => '-20',  // last 20 orders
]);

// Access order history details
foreach ($orders->orders as $order) {
    echo $order->order_id;    // Order ID of the transaction related to this entry
    echo $order->row_id;      // Row ID of the order in the database
    echo $order->amount;      // The amount of money the order is for
    echo $order->summary;     // The summary of the order
    echo $order->refundable;  // Whether the order can be refunded
    echo $order->paid;        // Whether the order has been paid or not
    
    // Access timestamp (Unix timestamp)
    echo $order->timestamp->t_s; // When the order was created
}

Refund Order

Initiate a refund for a specific order:

use Taler\Api\Order\Dto\RefundRequest;

// Create refund request
$refundRequest = new RefundRequest(
    refund: 'EUR:10.00',  // Amount to be refunded
    reason: 'Customer request'  // Human-readable refund justification
);

// Initiate refund
$refund = $orderClient->refundOrder('order_123', $refundRequest);

// Access refund response details
echo $refund->taler_refund_uri;  // URL for wallet to process refund
echo $refund->h_contract;        // Contract hash for request authentication

Handle errors for Refund Order

The backend may deny a refund for legal reasons (451). The SDK raises a typed exception with structured data:

use Taler\Api\Order\Dto\RefundRequest;
use Taler\Exception\PaymentDeniedLegallyException; // HTTP 451
use Taler\Exception\TalerException;

$refundRequest = new RefundRequest(
    refund: 'EUR:10.00',
    reason: 'Customer request'
);

try {
    $refund = $orderClient->refundOrder('order_123', $refundRequest);
    echo $refund->taler_refund_uri;
} catch (PaymentDeniedLegallyException $e) { // 451 Unavailable For Legal Reasons
    $dto = $e->getResponseDTO();
    if ($dto !== null) {
        // $dto->exchange_base_urls (array<int, string>)
    }
    // Recover: refresh coins from listed exchanges or retry via others
} catch (TalerException $e) {
    // Other API errors
    throw $e;
} catch (\Throwable $e) {
    // Transport/runtime errors
    throw $e;
}

Delete Order

Delete a specific order:

// Delete an order by ID
$orderClient->deleteOrder('order_123');

Forget Order

Request the backend to forget specific fields of an order's contract terms.

Notes:

The request uses HTTP PUT and returns no content on success (HTTP 200).
A valid JSON path must begin with $. and end with a field identifier. Array indices and wildcards * are allowed inside the path, but the path cannot end with an index or wildcard.

use Taler\Api\Order\Dto\ForgetRequest;

// Create forget request
$forgetRequest = new ForgetRequest([
    '$.wire_fee',
    '$.products[0].description',
    // Wildcards allowed as long as the path ends with a field
    '$.products[*].description'
]);

// Send forget request (void on success)
$orderClient->forgetOrder('order_123', $forgetRequest);

// With custom headers
$orderClient->forgetOrder(
    orderId: 'order_123',
    forgetRequest: $forgetRequest,
    headers: [
        'X-Custom-Header' => 'value'
    ]
);

If the order or paths are invalid, a TalerException will be thrown.

Note: The delete operation returns no content on success (HTTP 204). If the order doesn't exist or can't be deleted, a TalerException will be thrown.

Asynchronous Operations

All methods support asynchronous operations with the Async suffix:

// Get orders asynchronously
$ordersPromise = $orderClient->getOrdersAsync();

// Handle the promise
$ordersPromise->then(function ($orders) {
    // Handle orders response
});

Error Handling

The Order API methods may throw exceptions that you should handle:

use Taler\Exception\TalerException;

try {
    $orders = $orderClient->getOrders();
} catch (TalerException $e) {
    // Handle Taler-specific errors
    echo $e->getMessage();
} catch (\Throwable $e) {
    // Handle other errors
    echo $e->getMessage();
}

Inspect structured error details (TalerException::getResponseDTO)

When the backend returns a JSON error response, TalerException::getResponseDTO() parses it into an ErrorDetail DTO for convenient, typed access.

use Taler\Exception\TalerException;
use Taler\Api\Dto\ErrorDetail;

try {
    $orders = $orderClient->getOrders();
} catch (TalerException $e) {
    /** @var ErrorDetail|null $err */
    $err = $e->getResponseDTO();
    if ($err !== null) {
        // Numeric error code unique to the condition
        echo $err->code . "\n";
        // Human-readable hint from the server (optional)
        echo ($err->hint ?? '') . "\n";
        // Additional optional fields may be present depending on the API
        // e.g., $err->detail, $err->parameter, $err->path, $err->extra
    }

    // Fallback to raw array if needed
    // $json = $e->getResponseJson();
}

Response Types

By default, responses are wrapped in DTOs (OrderHistory and its nested objects). You can configure this behavior:

// Disable DTO wrapping to get raw array responses
$orders = $taler->config(['wrapResponse' => false])->order()->getOrders();

/*
Array response example:
[
    'orders' => [
        [
            'order_id' => 'order_123',
            'row_id' => 1,
            'timestamp' => ['t_s' => 1234567890],
            'amount' => '10.00',
            'summary' => 'Order description',
            'refundable' => true,
            'paid' => true
        ],
        // ... more orders
    ]
]
*/

// Raw array response for refunds
$refund = $taler->config(['wrapResponse' => false])->order()->refundOrder(
    'order_123',
    new RefundRequest('10.00', 'Customer request')
);

/*
Array response example:
[
    'taler_refund_uri' => 'taler://refund/...',
    'h_contract' => 'hash_value'
]
*/

Config API

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net',
    'token'    => 'Bearer token'
]);

$configClient = $taler->configApi();

Get Merchant Config

$config = $taler->configApi()->getConfig(); // MerchantVersionResponse

// Core fields
echo $config->version;   // e.g., "42:1:0" (libtool current:revision:age)
echo $config->name;      // always "taler-merchant"
echo $config->currency;  // default currency, e.g., "EUR"

// Currency specifications (map of code => CurrencySpecification)
foreach ($config->currencies as $code => $spec) {
    echo $code;                         // e.g., "EUR"
    echo $spec->name;                   // e.g., "Euro"
    echo $spec->alt_unit_names['0'];    // base symbol/name, e.g., "€"
}

// Trusted exchanges
foreach ($config->exchanges as $ex) { // array of ExchangeConfigInfo
    echo $ex->base_url;  // e.g., "https://exchange.example.com"
    echo $ex->currency;  // e.g., "EUR"
    echo $ex->master_pub; // EddsaPublicKey as string
}

// Capabilities
echo $config->have_self_provisioning ? 'yes' : 'no'; // bool
echo $config->have_donau ? 'yes' : 'no';             // bool

// Optional TAN channels (array of strings: "sms", "email")
if ($config->mandatory_tan_channels !== null) {
    foreach ($config->mandatory_tan_channels as $ch) {
        echo $ch;
    }
}

Credential Health Check

Quickly validate that your current Taler instance is properly configured and authenticated. This performs a minimal set of safe checks using the instance you already created:

GET /config (always)
If token is non-empty: GET private (instance exists and is reachable)
If token is non-empty: GET private/orders?limit=1 (auth-only harmless call)

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$diagnose = $taler->configCheck();

if ($diagnose['ok']) {
    // All checks passed – proceed with normal operations
} else {
    // Inspect failing step(s): 'config', 'instance', 'auth'
    // Each step contains: ok (bool), status (?int), error (?string), exception (?Throwable)
    $failed = array_filter([
        'config' => $diagnose['config'] ?? null,
        'instance' => $diagnose['instance'] ?? null,
        'auth' => $diagnose['auth'] ?? null,
    ], fn($x) => is_array($x) && ($x['ok'] ?? false) === false);

    // Example: log the most relevant failure
    if (!empty($failed)) {
        $first = reset($failed);
        error_log('Health check failed: ' . (($first['error'] ?? 'unknown') . ' (status=' . (($first['status'] ?? null) ?? 'n/a') . ')'));
        // Optionally inspect original exception object for details
        // $ex = $first['exception'] ?? null; // instance of Taler\\Exception\\TalerException or other Throwable
    }
}

Example report shape (abbreviated):

[
  'ok' => false,
  'config' => ['ok' => true, 'status' => 200, 'error' => null],
  'instance' => ['ok' => true, 'status' => 200, 'error' => null],
  'auth' => ['ok' => false, 'status' => 401, 'error' => 'unauthorized', 'exception' => TalerException],
]

Notes:

If the token is empty, the instance/auth checks are skipped and 'ok' reflects only the /config result.
The exception field contains the original exception object for diagnostics; avoid serializing it directly. If you need a compact form, extract class, code, message, and optional response details.

With custom headers:

$config = $taler->configApi()->getConfig([
    'X-Custom-Header' => 'value'
]);

Raw array response (disable DTO wrapping):

$array = $taler
    ->config(['wrapResponse' => false])
    ->configApi()
    ->getConfig();

// Example shape (abbreviated):
// [
//   'version' => '42:1:0',
//   'currency' => 'EUR',
//   'currencies' => [ 'EUR' => [ 'name' => 'Euro', 'currency' => 'EUR', ... ] ],
//   'exchanges' => [ [ 'base_url' => 'https://exchange.example.com', 'currency' => 'EUR', 'master_pub' => '...' ] ],
//   'have_self_provisioning' => true,
//   'have_donau' => false,
//   'mandatory_tan_channels' => ['sms','email']
// ]

Inventory

Reference: Merchant Backend Inventory API.

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$inventory = $taler->inventory();

Products

Get Products

use Taler\Api\Inventory\Dto\GetProductsRequest;

$req = new GetProductsRequest(limit: 20, offset: '10');
$summary = $inventory->getProducts($req); // InventorySummaryResponse

foreach ($summary->products as $entry) {
    echo $entry->product_id;    // string
    echo $entry->product_serial; // int
}

Get Product

$product = $inventory->getProduct('coffee-1kg'); // ProductDetail

echo $product->product_name; // string
echo $product->price;        // Amount as string, e.g. "EUR:12.50"

Create Product

use Taler\Api\Inventory\Dto\ProductAddDetail;
use Taler\Api\Dto\RelativeTime;

$details = new ProductAddDetail(
    product_id: 'coffee-1kg',
    description: 'Arabica beans 1kg',
    unit: 'kg',
    price: 'EUR:12.50',
    total_stock: 100,
    product_name: 'Coffee Beans',
);

$inventory->createProduct($details); // 204 No Content

Update Product

use Taler\Api\Inventory\Dto\ProductPatchDetail;

$patch = new ProductPatchDetail(
    description: 'Arabica beans 1kg (fresh roast)',
    unit: 'kg',
    price: 'EUR:12.50',
    total_stock: 150
);

$inventory->updateProduct('coffee-1kg', $patch); // 204 No Content

Delete Product

$inventory->deleteProduct('coffee-1kg'); // 204 No Content. 404 may be treated as no-op.

POS Configuration

$pos = $inventory->getPos(); // FullInventoryDetailsResponse

foreach ($pos->categories as $cat) {
    echo $cat->id . ':' . $cat->name . "\n";
}

foreach ($pos->products as $p) {
    echo $p->product_id . ' => ' . $p->price . "\n";
}

Lock Product Quantity

Lock or unlock a quantity for a short duration.

use Taler\Api\Inventory\Dto\LockRequest;
use Taler\Api\Dto\RelativeTime;

$lock = new LockRequest(
    lock_uuid: '123e4567-e89b-12d3-a456-426614174000',
    duration: new RelativeTime(60_000_000), // 60 seconds
    quantity: 2                              
);

$inventory->lockProduct('coffee-1kg', $lock); // 204 No Content

Raw Array Response

Like other clients, you can disable DTO wrapping:

$array = $taler
    ->config(['wrapResponse' => false])
    ->inventory()
    ->getProducts();

Asynchronous Operations

All Inventory methods support asynchronous operations using the Async suffix (e.g., getProductsAsync, getPosAsync, lockProductAsync).

Tracking Wire Transfers

Reference: Merchant Backend: GET /instances/$INSTANCE/private/transfers

The Wire Transfers API lets you list wire transfers credited to the merchant, optionally filtered via query parameters.

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$wireTransfers = $taler->wireTransfers();

Get Transfers

use Taler\Api\WireTransfers\Dto\GetTransfersRequest;

// Without filters (default server-side paging)
$list = $wireTransfers->getTransfers(); // TransfersList

foreach ($list->transfers as $transfer) {
    echo $transfer->credit_amount;      // e.g. "EUR:100.00"
    echo $transfer->wtid;               // Wire transfer identifier
    echo $transfer->payto_uri;          // Merchant payto URI
    echo $transfer->exchange_url;       // Exchange base URL
    echo $transfer->transfer_serial_id; // Serial ID
    echo $transfer->execution_time->t_s;// Unix timestamp
    echo $transfer->verified ? 'yes' : 'no';     // optional
    echo $transfer->confirmed ? 'yes' : 'no';    // optional
    echo $transfer->expected ? 'yes' : 'no';     // optional
}

// With filters
$request = new GetTransfersRequest(
    payto_uri: 'payto://iban/DE89370400440532013000?receiver-name=Example%20Merchant',
    after: '1700000000', // returns transfers after this timestamp (string per API)
    limit: 20,
);

$filtered = $wireTransfers->getTransfers($request, [
    'X-Custom-Header' => 'value'
]);

Asynchronous

$promise = $wireTransfers->getTransfersAsync();
$promise->then(function ($list) {
    // $list is TransfersList when wrapResponse is true
});

Raw Array Response

use Taler\Api\WireTransfers\Dto\GetTransfersRequest;

$req = new GetTransfersRequest(limit: 10);

$arrayResponse = $taler
    ->config(['wrapResponse' => false])
    ->wireTransfers()
    ->getTransfers($req);

// Example shape:
// [
//   'transfers' => [
//     [
//       'credit_amount' => 'EUR:10.00',
//       'wtid' => 'WTID...',
//       'payto_uri' => 'payto://...',
//       'exchange_url' => 'https://exchange.example.com',
//       'transfer_serial_id' => 123,
//       'execution_time' => ['t_s' => 1700000000],
//       'verified' => true,
//       'confirmed' => false,
//       'expected' => true
//     ]
//   ]
// ]

Delete Transfer

Reference: Merchant Backend: DELETE /instances/$INSTANCE/private/transfers/$TID

// Delete by transfer serial ID (TID). 204 No Content on success.
$taler->wireTransfers()->deleteTransfer('123');

// With custom headers
$taler->wireTransfers()->deleteTransfer('123', [
    'X-Custom-Header' => 'value'
]);

Async variant:

$promise = $taler->wireTransfers()->deleteTransferAsync('123');
$promise->then(function () {
    // Deleted
});

Errors raise Taler\Exception\TalerException (e.g., not found).

Bank Accounts

https://docs.taler.net/core/api-merchant.html#bank-accounts

Basic Setup

use Taler\Factory\Factory;
use Taler\Api\BankAccounts\Dto\AccountAddDetails;
use Taler\Api\BankAccounts\Dto\BasicAuthFacadeCredentials;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$bankAccountClient = $taler->bankAccount();

Create Bank Account

Minimal example with only a payto URI:

$details = new AccountAddDetails(
    payto_uri: 'payto://iban/DE89370400440532013000?receiver-name=Example%20Merchant'
);

try {
    $response = $bankAccountClient->createAccount($details);
    echo "h_wire: {$response->h_wire}\n";
    echo "salt:   {$response->salt}\n";
} catch (\Taler\Exception\TalerException $exception) {
    // Handle API error
}

With facade URL and Basic credentials with error handling and debug:

$details = new AccountAddDetails(
    payto_uri: 'payto://iban/DE89370400440532013000?receiver-name=Example%20Merchant',
    credit_facade_url: 'https://bank-facade.example.com/api',
    credit_facade_credentials: new BasicAuthFacadeCredentials('facade-user', 'facade-pass')
);

try {
    $response = $bankAccountClient->createAccount($details);
    echo "h_wire: {$response->h_wire}\n";
    echo "salt:   {$response->salt}\n";
    // dd($response); // if using Symfony VarDumper or similar
} catch (\Taler\Exception\TalerException $exception) {
    // dd($exception->getMessage(), $exception->getCode(), $exception->getRawResponseBody());
}

Error handling follows the same pattern as other APIs and may throw Taler\Exception\TalerException.

Get Bank Accounts

Retrieve all bank accounts configured for the merchant instance. See docs: https://docs.taler.net/core/api-merchant.html#get-[-instances-$INSTANCE]-private-accounts

try {
    $summary = $bankAccountClient->getAccounts(); // AccountsSummaryResponse

    foreach ($summary->accounts as $account) {
        echo $account->payto_uri . "\n"; // payto URI
        echo $account->h_wire . "\n";    // hash of wire details
        echo ($account->active ? 'active' : 'inactive') . "\n";
    }
} catch (\Taler\Exception\TalerException $exception) {
    // Handle API error
}

Raw array response (disable DTO wrapping):

$summary = $taler
    ->config(['wrapResponse' => false])
    ->bankAccount()
    ->getAccounts();

// Example shape:
// [
//   'accounts' => [
//       ['payto_uri' => 'payto://iban/..', 'h_wire' => '...', 'active' => true],
//       // ...
//   ]
// ]

Get Bank Account

Retrieve a specific bank account by its h_wire. See docs: https://docs.taler.net/core/api-merchant.html#get-[-instances-$INSTANCE]-private-accounts-$H_WIRE

$hWire = 'your-h-wire-hash';

try {
    $account = $bankAccountClient->getAccount($hWire); // BankAccountDetail

    echo $account->payto_uri . "\n";           // full payto URI
    echo $account->h_wire . "\n";              // hash over wire details
    echo $account->salt . "\n";                // salt used to compute h_wire
    echo ($account->active ? 'active' : 'inactive') . "\n";
    echo ($account->credit_facade_url ?? '');    // optional
} catch (\Taler\Exception\TalerException $exception) {
    // Handle API error
}

Update Bank Account

Update a specific bank account by its h_wire. Returns no content on success (HTTP 204). See docs: PATCH /instances/$INSTANCE/private/accounts/$H_WIRE

Set or update the credit facade URL and credentials:

use Taler\Api\BankAccounts\Dto\AccountPatchDetails;
use Taler\Api\BankAccounts\Dto\BasicAuthFacadeCredentials;

$hWire = 'your-h-wire-hash';

// Provide facade URL and Basic credentials
$patch = new AccountPatchDetails(
    credit_facade_url: 'https://bank-facade.example.com/api',
    credit_facade_credentials: new BasicAuthFacadeCredentials('facade-user', 'facade-pass')
);

// Apply update (204 No Content on success)
$bankAccountClient->updateAccount($hWire, $patch);

Remove stored facade credentials (preserving other fields):

use Taler\Api\BankAccounts\Dto\AccountPatchDetails;
use Taler\Api\BankAccounts\Dto\NoFacadeCredentials;

$hWire = 'your-h-wire-hash';

$patch = new AccountPatchDetails(
    credit_facade_credentials: new NoFacadeCredentials()
);

$bankAccountClient->updateAccount($hWire, $patch);

Update only the facade URL (keep existing credentials):

use Taler\Api\BankAccounts\Dto\AccountPatchDetails;

$hWire = 'your-h-wire-hash';

$patch = new AccountPatchDetails(
    credit_facade_url: 'https://bank-facade.example.com/v2'
);

$bankAccountClient->updateAccount($hWire, $patch);

Delete Bank Account

Delete a specific bank account by its h_wire. Returns no content on success (HTTP 204). See docs: DELETE /instances/$INSTANCE/private/accounts/$H_WIRE

$hWire = 'your-h-wire-hash';

try {
    // 204 No Content on success
    $bankAccountClient->deleteAccount($hWire);
} catch (\Taler\Exception\TalerException $exception) {
    // Handle API error
}

With custom headers:

$bankAccountClient->deleteAccount(
    hWire: 'your-h-wire-hash',
    headers: [
        'X-Custom-Header' => 'value'
    ]
);

Asynchronous Operations

All Bank Accounts methods support asynchronous operations using the Async suffix:

// Get bank accounts asynchronously
$accountsPromise = $bankAccountClient->getAccountsAsync();

// Handle the promise
$accountsPromise->then(function ($summary) {
    // $summary is an AccountsSummaryResponse when wrapResponse is true
    foreach ($summary->accounts as $account) {
        // Handle each bank account entry
        // $account->payto_uri, $account->h_wire, $account->active
    }
});

OTP Devices

Reference: Merchant Backend: POST /instances/$INSTANCE/private/otp-devices

Create and register an OTP device to generate POS confirmations for orders.

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$otpDevices = $taler->otpDevices();

Create OTP Device

The API accepts the algorithm as integer or string per the docs:

0 or "NONE": no algorithm
1 or "TOTP_WITHOUT_PRICE": without amounts (typical OTP device)
2 or "TOTP_WITH_PRICE": with amounts (special-purpose OTP device)

On success, the endpoint returns HTTP 204 No Content.

use Taler\Api\OtpDevices\Dto\OtpDeviceAddDetails;

$details = new OtpDeviceAddDetails(
    otp_device_id: 'pos-device-1',
    otp_device_description: 'Main counter POS',
    otp_key: 'JBSWY3DPEHPK3PXP', // Base32-encoded secret
    otp_algorithm: 'TOTP_WITHOUT_PRICE' // or 0|1|2 or "NONE"|"TOTP_WITH_PRICE"
);

try {
    // 204 No Content on success
    $otpDevices->createOtpDevice($details);
    echo "OTP device created\n";
} catch (\Taler\Exception\TalerException $e) {
    // Handle Taler-specific API errors
    echo $e->getMessage();
} catch (\Throwable $e) {
    // Handle other errors
    echo $e->getMessage();
}

Update OTP Device

Reference: Merchant Backend: PATCH /instances/$INSTANCE/private/otp-devices/$DEVICE_ID

Update a registered OTP device. Returns HTTP 204 No Content on success.

use Taler\Api\OtpDevices\Dto\OtpDevicePatchDetails;

$otpDevices = $taler->otpDevices();

// Minimal: update the description only (required)
$patch = new OtpDevicePatchDetails(
    otp_device_description: 'Front desk POS'
);

// Apply update (204 No Content on success)
$otpDevices->updateOtpDevice('pos-device-1', $patch);

// Optional: update key/algorithm/counter as well
// $patch = new OtpDevicePatchDetails(
//     otp_device_description: 'Front desk POS',
//     otp_key: 'JBSWY3DPEHPK3PXP',           // Base32-encoded secret
//     otp_algorithm: 'TOTP_WITH_PRICE',      // or 0|1|2 or "NONE"|"TOTP_WITHOUT_PRICE"
//     otp_ctr: 0
// );
// $otpDevices->updateOtpDevice('pos-device-1', $patch);

Get OTP Device

Reference: Merchant Backend: GET /instances/$INSTANCE/private/otp-devices/$DEVICE_ID

Retrieve details of a specific OTP device.

use Taler\Api\OtpDevices\Dto\GetOtpDeviceRequest;

$otpDevices = $taler->otpDevices();

// Without query parameters
$device = $otpDevices->getOtpDevice('pos-device-1'); // OtpDeviceDetails

echo $device->device_description; // e.g., "Main counter POS"
echo $device->otp_algorithm;      // e.g., 1 or "TOTP_WITHOUT_PRICE"
echo $device->otp_timestamp;      // Unix timestamp (int)

// Optional fields (may be null)
echo $device->otp_ctr ?? '';
echo $device->otp_code ?? '';

// With query parameters and custom headers
$request = new GetOtpDeviceRequest(
    faketime: 1700000000,
    price: 'EUR:1.23'
);

$device = $otpDevices->getOtpDevice(
    deviceId: 'pos-device-1',
    request: $request,
    headers: [ 'X-Custom-Header' => 'value' ]
);

Raw array response (disable DTO wrapping):

$array = $taler
    ->config(['wrapResponse' => false])
    ->otpDevices()
    ->getOtpDevice('pos-device-1');

// Example shape:
// [
//   'device_description' => 'Main counter POS',
//   'otp_algorithm' => 'TOTP_WITHOUT_PRICE', // or 0|1|2
//   'otp_timestamp' => 1700000000,           // int
//   'otp_ctr' => 0,                          // optional
//   'otp_code' => '123456'                   // optional
// ]

Get OTP Devices

Reference: Merchant Backend: GET /instances/$INSTANCE/private/otp-devices

Retrieve all registered OTP devices for the instance.

// Returns OtpDevicesSummaryResponse by default
$summary = $otpDevices->getOtpDevices();

foreach ($summary->otp_devices as $device) {
    echo $device->otp_device_id . "\n";      // e.g., "pos-device-1"
    echo $device->device_description . "\n";  // e.g., "Main counter POS"
}

// With custom headers
$summary = $otpDevices->getOtpDevices([
    'X-Custom-Header' => 'value'
]);

Raw array response (disable DTO wrapping):

$summary = $taler
    ->config(['wrapResponse' => false])
    ->otpDevices()
    ->getOtpDevices();

// Example shape:
// [
//   'otp_devices' => [
//     [ 'otp_device_id' => 'device1', 'device_description' => 'Front desk POS' ],
//     [ 'otp_device_id' => 'device2', 'device_description' => 'Side counter POS' ],
//   ]
// ]

Delete OTP Device

Reference: Merchant Backend: DELETE /instances/$INSTANCE/private/otp-devices/$DEVICE_ID

// Delete a specific OTP device by ID. 204 No Content on success.
$otpDevices->deleteOtpDevice('pos-device-1');

// With custom headers
$otpDevices->deleteOtpDevice('pos-device-1', [
    'X-Custom-Header' => 'value'
]);

Asynchronous

All OTP Device methods support asynchronous operations using the Async suffix:

use Taler\Api\OtpDevices\Dto\OtpDeviceAddDetails;

$details = new OtpDeviceAddDetails(
    otp_device_id: 'pos-device-2',
    otp_device_description: 'Side counter POS',
    otp_key: 'JBSWY3DPEHPK3PXP',
    otp_algorithm: 1 // TOTP_WITHOUT_PRICE
);

try {
    $promise = $otpDevices->createOtpDeviceAsync($details);
    // Promise resolves to null on 204
    $promise->wait();
    echo "OTP device created (async)\n";
} catch (\Taler\Exception\TalerException $e) {
    echo $e->getMessage();
} catch (\Throwable $e) {
    echo $e->getMessage();
}

Templates

https://docs.taler.net/core/api-merchant.html#templates

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$templates = $taler->templates();

Create Template

Returns no content on success (HTTP 204).

use Taler\Api\Templates\Dto\TemplateAddDetails;
use Taler\Api\Templates\Dto\TemplateContractDetails;
use Taler\Api\Dto\RelativeTime;

$details = new TemplateAddDetails(
    template_id: 'invoice-2025',
    template_description: 'Default invoice template',
    template_contract: new TemplateContractDetails(
        minimum_age: 18,
        pay_duration: new RelativeTime(3600),
        summary: 'Service fee',
        currency: 'EUR',
        amount: 'EUR:10.00',
    ),
    otp_id: 'pos-device-1',
    editable_defaults: ['summary' => 'Editable']
);

// 204 No Content on success
$templates->createTemplate($details);

Update Template

Returns no content on success (HTTP 204).

use Taler\Api\Templates\Dto\TemplatePatchDetails;
use Taler\Api\Templates\Dto\TemplateContractDetails;
use Taler\Api\Dto\RelativeTime;

$patch = new TemplatePatchDetails(
    template_description: 'Updated description',
    template_contract: new TemplateContractDetails(
        minimum_age: 21,
        pay_duration: new RelativeTime(5400),
        summary: 'Updated service fee',
        currency: 'EUR',
        amount: 'EUR:12.00',
    ),
    otp_id: 'pos-device-2',
    editable_defaults: ['summary' => 'Editable']
);

// Apply update (204 No Content on success)
$templates->updateTemplate('invoice-2025', $patch);

Get Templates

$summary = $templates->getTemplates(); // TemplatesSummaryResponse by default

foreach ($summary->templates as $entry) {
    echo $entry->template_id . "\n";          // e.g., "invoice-2025"
    echo $entry->template_description . "\n"; // e.g., "Default invoice template"
}

Raw array response (disable DTO wrapping):

$summaryArray = $taler
    ->config(['wrapResponse' => false])
    ->templates()
    ->getTemplates();

// Example shape:
// [ 'templates' => [ ['template_id' => 'invoice-2025', 'template_description' => '...'], ... ] ]

Get Template

$details = $templates->getTemplate('invoice-2025'); // TemplateDetails

echo $details->template_id;           // "invoice-2025"
echo $details->template_description;  // description

// Contract defaults
$contract = $details->template_contract;
echo $contract->summary;      // e.g., "Service fee"
echo $contract->currency;     // e.g., "EUR"
echo $contract->amount;       // e.g., "EUR:10.00"
echo $contract->minimum_age;  // e.g., 18
echo $contract->pay_duration->d_us; // microseconds or string representation

// Optional fields
echo $details->otp_id ?? '';
var_dump($details->editable_defaults ?? null);

Raw array response:

$detailsArray = $taler
    ->config(['wrapResponse' => false])
    ->templates()
    ->getTemplate('invoice-2025');

// Example shape:
// [
//   'template_id' => 'invoice-2025',
//   'template_description' => '...',
//   'template_contract' => [ 'summary' => '...', 'currency' => 'EUR', 'amount' => 'EUR:10.00', 'minimum_age' => 18, 'pay_duration' => ['d_us' => 3600000000] ],
//   'otp_id' => 'pos-device-1',
//   'editable_defaults' => ['summary' => 'Editable']
// ]

Delete Template

Returns no content on success (HTTP 204).

$templates->deleteTemplate('invoice-2025');

// With custom headers
$templates->deleteTemplate('invoice-2025', [
    'X-Custom-Header' => 'value'
]);

Asynchronous Operations

All Templates methods support asynchronous operations with the Async suffix:

$promise = $templates->getTemplatesAsync();
$promise->then(function ($result) {
    // $result is TemplatesSummaryResponse when wrapResponse is true
});

Token Families

The Token Families API lets you manage token families (discounts or subscriptions) for a merchant instance.

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$tokenFamilies = $taler->tokenFamilies();

Create Token Family

Create a new token family. Returns no content on success (HTTP 204).

use Taler\Api\TokenFamilies\Dto\TokenFamilyCreateRequest;
use Taler\Api\Dto\Timestamp;
use Taler\Api\Dto\RelativeTime;

$request = new TokenFamilyCreateRequest(
    slug: 'family-01',
    name: 'My Family',
    description: 'Human-readable description',
    description_i18n: ['en' => 'Human-readable description'],
    // For a discount family, use expected_domains; for a subscription family, use trusted_domains
    extra_data: ['expected_domains' => ['example.com']],
    valid_after: new Timestamp(1700000000),
    valid_before: new Timestamp(1800000000),
    // Ensure duration >= validity_granularity + start_offset
    duration: new RelativeTime(60_000_000),            // 1 minute
    validity_granularity: new RelativeTime(60_000_000),// 1 minute
    start_offset: new RelativeTime(0),
    kind: 'discount'                                   // or 'subscription'
);

// 204 No Content on success
$tokenFamilies->createTokenFamily($request);

Update Token Family

Update an existing token family. Returns detailed information (HTTP 200) as TokenFamilyDetails.

use Taler\Api\TokenFamilies\Dto\TokenFamilyUpdateRequest;
use Taler\Api\Dto\Timestamp;

$patch = new TokenFamilyUpdateRequest(
    name: 'Updated Name',
    description: 'Updated Description',
    description_i18n: ['en' => 'Updated Description'],
    // Depends on the token family kind; adjust accordingly
    extra_data: ['trusted_domains' => ['example.com']],
    valid_after: new Timestamp(1700000100),
    valid_before: new Timestamp(1800000100)
);

// Returns TokenFamilyDetails on HTTP 200
$details = $tokenFamilies->updateTokenFamily('family-01', $patch);

Get Token Families

List all configured token families for the instance. Returns TokenFamiliesList (HTTP 200).

$list = $tokenFamilies->getTokenFamilies(); // TokenFamiliesList

foreach ($list->token_families as $family) {
    echo $family->slug . "\n";           // e.g., "family-01"
    echo $family->name . "\n";           // human-readable name
    echo $family->kind . "\n";           // "discount" or "subscription"
    echo $family->valid_after->t_s . "\n";// Unix timestamp
    echo $family->valid_before->t_s . "\n";// Unix timestamp
}

Get Token Family

Get detailed information about a specific token family. Returns TokenFamilyDetails (HTTP 200).

$details = $tokenFamilies->getTokenFamily('family-01'); // TokenFamilyDetails

echo $details->slug;                      // e.g., "family-01"
echo $details->name;                      // human-readable name
echo $details->description;               // description
echo $details->kind;                      // "discount" or "subscription"
echo $details->issued;                    // number of tokens issued
echo $details->used;                      // number of tokens used
echo $details->valid_after->t_s;          // Unix timestamp
echo $details->valid_before->t_s;         // Unix timestamp
echo $details->duration->d_us;            // microseconds
echo $details->validity_granularity->d_us;// microseconds
echo $details->start_offset->d_us;        // microseconds

// Optional
var_dump($details->description_i18n ?? null);
var_dump($details->extra_data ?? null);

Delete Token Family

Delete a specific token family. Returns no content on success (HTTP 204).

$tokenFamilies->deleteTokenFamily('family-01');

// With custom headers
$tokenFamilies->deleteTokenFamily('family-01', [
    'X-Custom-Header' => 'value'
]);

Asynchronous Operations

Every Token Families method also supports an async variant using the Async suffix (e.g., getTokenFamiliesAsync, getTokenFamilyAsync, createTokenFamilyAsync, updateTokenFamilyAsync, deleteTokenFamilyAsync).

// Example: Get token families asynchronously
$promise = $taler->tokenFamilies()->getTokenFamiliesAsync();

$promise->then(function ($result) {
    // $result is TokenFamiliesList when wrapResponse is true
});

Webhooks

https://docs.taler.net/core/api-merchant.html#webhooks

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$webhooks = $taler->webhooks();

Create Webhook

Returns no content on success (HTTP 204).

use Taler\Api\Webhooks\Dto\WebhookAddDetails;

$details = new WebhookAddDetails(
    webhook_id: 'checkout-completed',
    event_type: 'ORDER_PAID',
    url: 'https://example.com/webhooks/order-paid',
    http_method: 'POST',
    header_template: '{"X-Webhook":"paid"}',  // optional
    body_template: '{"order_id":"$order_id"}' // optional
);

// 204 No Content on success
$webhooks->createWebhook($details);

Update Webhook

Returns no content on success (HTTP 204).

use Taler\Api\Webhooks\Dto\WebhookPatchDetails;

$patch = new WebhookPatchDetails(
    event_type: 'ORDER_PAID',
    url: 'https://example.com/webhooks/order-paid-v2',
    http_method: 'POST',
    header_template: '{"X-Webhook":"paid"}',   // optional
    body_template: '{"order_id":"$order_id"}'  // optional
);

$webhooks->updateWebhook('checkout-completed', $patch);

Get Webhooks

$summary = $webhooks->getWebhooks(); // WebhookSummaryResponse

foreach ($summary->webhooks as $entry) {
    echo $entry->webhook_id . "\n"; // e.g., "checkout-completed"
    echo $entry->event_type . "\n"; // e.g., "ORDER_PAID"
}

// With custom headers
$summary = $webhooks->getWebhooks([
    'X-Custom-Header' => 'value'
]);

Get Webhook

$details = $webhooks->getWebhook('checkout-completed'); // WebhookDetails

echo $details->event_type;     // e.g., "ORDER_PAID"
echo $details->url;            // e.g., "https://example.com/webhooks/order-paid"
echo $details->http_method;    // e.g., "POST"
echo $details->header_template ?? ''; // optional
echo $details->body_template ?? '';   // optional

Delete Webhook

Returns no content on success (HTTP 204).

$webhooks->deleteWebhook('checkout-completed');

// With custom headers
$webhooks->deleteWebhook('checkout-completed', [
    'X-Custom-Header' => 'value'
]);

Asynchronous Operations

Every Webhooks method also supports an async variant using the Async suffix (e.g., createWebhookAsync, updateWebhookAsync, getWebhooksAsync, getWebhookAsync, deleteWebhookAsync).

use Taler\Api\Webhooks\Dto\WebhookAddDetails;

$details = new WebhookAddDetails(
    webhook_id: 'checkout-completed',
    event_type: 'ORDER_PAID',
    url: 'https://example.com/webhooks/order-paid',
    http_method: 'POST'
);

$promise = $taler->webhooks()->createWebhookAsync($details);

// Promise resolves to null on 204 No Content
$promise->then(function () {
    echo "Webhook created (async)\n";
});

Donau Charity

Reference: Merchant Backend Donau Charity endpoints.

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$donau = $taler->donauCharity();

Get Linked Donau Charity Instances

// Returns DonauInstancesResponse by default
$response = $donau->getInstances();

foreach ($response->donau_instances as $donau) {
    echo $donau->donau_instance_serial . "\n"; // int
    echo $donau->charity_name . "\n";          // string
    echo $donau->donau_url . "\n";             // string (base URL)
    echo $donau->charity_id . "\n";            // int
    echo $donau->charity_pub_key . "\n";       // EddsaPublicKey as string
    echo $donau->charity_max_per_year . "\n";  // Amount as string, e.g. "EUR:1000"
    echo $donau->charity_receipts_to_date . "\n"; // Amount as string
    echo $donau->current_year . "\n";          // int
}

Raw array response (disable DTO wrapping):

$array = $taler
    ->config(['wrapResponse' => false])
    ->donauCharity()
    ->getInstances();

Link (Create) a Donau Charity

Returns no content on success (HTTP 204). When the backend requires MFA (since v21), a Challenge is returned (HTTP 202).

use Taler\Api\DonauCharity\Dto\PostDonauRequest;

$request = new PostDonauRequest(
    donau_url: 'https://donau.example', // https base URL of the Donau service
    charity_id: 7                       // numeric identifier within the Donau service
);

$challenge = $donau->createDonauCharity($request); // null on 204; Challenge on 202 (optional)

Unlink (Delete) a Donau Charity by Serial

Returns no content on success (HTTP 204). If the serial does not exist, a TalerException is thrown.

// Delete by Donau instance serial
$donau->deleteDonauCharityBySerial(321);

// With custom headers
$donau->deleteDonauCharityBySerial(321, [
    'X-Custom-Header' => 'value'
]);

Instance Management

Manage merchant instances and access tokens. Reference: Merchant Backend Instance API.

Basic Setup

use Taler\Factory\Factory;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token'
]);

$instances = $taler->instance();

Create Instance

use Taler\Api\Instance\Dto\InstanceConfigurationMessage;
use Taler\Api\Instance\Dto\InstanceAuthConfigToken;
use Taler\Api\Dto\Location;
use Taler\Api\Dto\RelativeTime;

$config = new InstanceConfigurationMessage(
    id: 'shop-1',
    name: 'My Shop',
    auth: new InstanceAuthConfigToken(password: 'super-secret'),
    address: new Location(country: 'DE', town: 'Berlin'),
    jurisdiction: new Location(country: 'DE', town: 'Berlin'),
    use_stefan: true,
    default_wire_transfer_delay: new RelativeTime(3600_000_000), // 1 hour
    default_pay_delay: new RelativeTime(300_000_000),            // 5 minutes
    email: 'merchant@example.com'
);

// 204 No Content on success (no return value)
$instances->createInstance($config);

Update Instance

use Taler\Api\Instance\Dto\InstanceReconfigurationMessage;
use Taler\Api\Dto\Location;
use Taler\Api\Dto\RelativeTime;

$patch = new InstanceReconfigurationMessage(
    name: 'My Shop GmbH',
    address: new Location(country: 'DE', town: 'Berlin'),
    jurisdiction: new Location(country: 'DE', town: 'Berlin'),
    use_stefan: true,
    default_wire_transfer_delay: new RelativeTime(7200_000_000), // 2 hours
    default_pay_delay: new RelativeTime(600_000_000),             // 10 minutes
    website: 'https://shop.example.com'
);

// 204 No Content on success
$instances->updateInstance('shop-1', $patch);

Get Instances

$list = $instances->getInstances(); // InstancesResponse

foreach ($list->instances as $i) {
    echo $i->id . ' => ' . $i->name . "\n";
}

Get Instance

$details = $instances->getInstance('shop-1'); // QueryInstancesResponse

echo $details->name;                          // e.g., "My Shop GmbH"
echo $details->merchant_pub;                  // EddsaPublicKey
echo $details->default_pay_delay->d_us;       // microseconds

Authentication & Access Tokens

Request a login token for an instance and list or revoke tokens.

use Taler\Api\Instance\Dto\LoginTokenRequest;
use Taler\Api\Dto\RelativeTime;

// Request a login token (Authorization header value)
$req = new LoginTokenRequest(
    scope: 'order-full',
    duration: new RelativeTime(3_600_000_000),
    description: 'Backoffice session'
);

$token = $instances->getAccessToken('shop-1', $req); // LoginTokenSuccessResponse
echo $token->access_token;                            // RFC 8959 prefix included

// List issued tokens (latest first by default)
use Taler\Api\Instance\Dto\GetAccessTokensRequest;
$tokens = $instances->getAccessTokens('shop-1', new GetAccessTokensRequest(limit: -20));
if ($tokens !== null) {
    foreach ($tokens->tokens as $t) {
        echo $t->serial . ' ' . $t->scope . "\n";
    }
}

// Revoke the token presented in the Authorization header
$instances->deleteAccessToken('shop-1'); // 204 No Content

// Revoke a token by its serial number
$instances->deleteAccessTokenBySerial('shop-1', 123); // 204 No Content

Alternatively, you can let the SDK manage access tokens automatically via the Factory. Provide username, password, and instance to Factory::create(...) (optionally scope, duration_us, description) and the SDK will obtain and refresh the token for you. See “Factory-managed authentication” in the Usage section above.

KYC Status

use Taler\Api\Instance\Dto\GetKycStatusRequest;

$kyc = $instances->getKycStatus('shop-1', new GetKycStatusRequest(
    h_wire: 'H_WIRE_HASH',
    lpt: 3,
    timeout_ms: 30_000
));

if ($kyc !== null) {
    // MerchantAccountKycRedirectsResponse
    foreach ($kyc->kyc_redirects as $r) {
        echo $r->exchange_url . "\n";
    }
}

Merchant Statistics

use Taler\Api\Instance\Dto\GetMerchantStatisticsAmountRequest;
use Taler\Api\Instance\Dto\GetMerchantStatisticsCounterRequest;

$amounts = $instances->getMerchantStatisticsAmount('shop-1', 'ORDERS', new GetMerchantStatisticsAmountRequest(by: 'BUCKET'));
echo $amounts->by_bucket[0]->amount; // e.g., "EUR:10.00"

$counters = $instances->getMerchantStatisticsCounter('shop-1', 'VISITS', new GetMerchantStatisticsCounterRequest(by: 'INTERVAL'));
echo $counters->by_interval[0]->count; // integer

Delete or Purge Instance

Disable or permanently purge an instance. When 2FA is required, a Challenge is returned (HTTP 202).

// Disable instance (204 on success, or Challenge on 202)
$challenge = $instances->deleteInstance('shop-1');
if ($challenge instanceof Taler\Api\Instance\Dto\Challenge) {
    echo $challenge->getChallengeId();
}

// Purge instance (irreversible)
$instances->deleteInstance('shop-1', purge: true);

Raw Array Responses

Like other clients, you can disable DTO wrapping:

$array = $taler
    ->config(['wrapResponse' => false])
    ->instance()
    ->getInstances();

Asynchronous Operations

All Instance methods also support asynchronous operations using the Async suffix.

$promise = $taler->instance()->getInstancesAsync();
$promise->then(function ($result) {
    // $result is InstancesResponse when wrapResponse is true
});

Two Factor Auth (2FA)

Certain protected operations (for example “update auth”, “change bank account”, or “delete instance”) may require a two-factor authentication. In such cases, the protected endpoint replies with HTTP 202 and a Challenge ID. You then:

Request transmission of a TAN for that Challenge
Confirm the Challenge with the received TAN
Repeat the original protected request with the exact same body and the Taler-Challenge-Ids header set to the Challenge ID

Basic setup

use Taler\Factory\Factory;
use Taler\Api\Instance\Dto\InstanceAuthConfigToken;
use Taler\Api\TwoFactorAuth\Dto\MerchantChallengeSolveRequest;

$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net',
    'token'    => 'Bearer token'
]);

$instances = $taler->instance();
$twofa     = $taler->twoFactorAuth();

1) Protected call returns Challenge (example: update auth)

// Example protected request that may require 2FA
$authConfig = new InstanceAuthConfigToken(password: 'new-secret');

// If 2FA is required, the method returns a Challenge (HTTP 202).
// If successful without 2FA, it returns null (HTTP 204).
$challenge = $instances->updateAuth('shop-1', $authConfig);

if ($challenge !== null) {
    $challengeId = $challenge->getChallengeId();
}

2) Request TAN for the challenge

// The body must be a JSON object, but can be empty; the SDK sends {} by default.
$response = $twofa->requestChallenge('shop-1', $challengeId);

// $response is ChallengeRequestResponse with timing guidance:
// $response->solve_expiration->t_s
// $response->earliest_retransmission->t_s

3) Confirm the challenge with the TAN

// TAN received out-of-band (e.g., SMS/email/UI input)
$tan = $merchantProvidedTan;
$solve = new MerchantChallengeSolveRequest($tan);
$twofa->confirmChallenge('shop-1', $challengeId, $solve); // 204 No Content on success

4) Repeat the original protected call with Taler-Challenge-Ids header

// IMPORTANT: The repeated request must exactly match the original request body.
// Provide the challenge ID as a header when repeating the operation:
$instances->updateAuth(
    instanceId: 'shop-1',
    authConfig: $authConfig,
    headers: ['Taler-Challenge-Ids' => $challengeId]
); // 204 on success

Notes:

Other protected operations (e.g., deleteInstance) follow the same pattern: try the operation, handle 202 Challenge, request TAN, confirm, then retry the operation with the Taler-Challenge-Ids header.
All 2FA-related request/response DTOs use SDK-wide conventions (e.g., factory createFromArray, request DTOs validate, response DTOs do not validate).
All actions also have methods suffixed with Async to run operations asynchronously.

Logging

The TalerPHP SDK supports logging through PSR-3 LoggerInterface. You can provide your own PSR-3 compatible logger (like Monolog) for logging of API interactions.

Basic Logging Setup

use Monolog\Logger;
use Monolog\Handler\StreamHandler;

// Create a Monolog logger
$logger = new Logger('taler');
$logger->pushHandler(new StreamHandler('path/to/your.log', Logger::DEBUG));

// Initialize Taler with logger (and enable SDK debug logging)
$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token',
    'logger'   => $logger,
    'debugLoggingEnabled' => true
]);

What Gets Logged

The SDK logs the following information:

HTTP request details (URL, method, headers)
HTTP response details (status code, sanitized headers, sanitized body preview)
Error conditions and exceptions
API operation failures

Notes:

Logging is performed only when debugLoggingEnabled is true. Otherwise, the SDK does not execute any logging code paths (zero overhead).
Request body logging is disabled.
Response body logging is sanitized and truncated:
- Secrets (e.g., Authorization tokens, access_token, api_key, client_secret, password) are redacted.
- Sensitive headers such as Authorization, Cookie, and Set-Cookie are redacted.
- URL userinfo (user:pass@) is redacted in logs.
- Sensitive query parameters in URLs (e.g., authorization, access_token, token, api_key, api-key, client_secret, password, pwd, merchant_sig, lpt) are redacted.
- URL-bearing headers like Location and Content-Location are sanitized (including query redaction).
- Only a preview (up to ~4KB) is logged; non-seekable streams are skipped.

Log Levels Used

DEBUG: Detailed request/response information
ERROR: API errors, request failures, and exceptions

Performance note:

Enabling DEBUG logging increases overhead due to header redaction and response body sanitization. For large responses this can be noticeable. If you do not need logging, do not provide a logger and keep debugLoggingEnabled as false (default).

Toggle at Runtime

You can enable or disable SDK debug logging at runtime:

// Enable
$taler->config(['debugLoggingEnabled' => true]);

// Disable
$taler->config(['debugLoggingEnabled' => false]);

Example Log Output

[2024-03-21 10:15:30] taler.DEBUG: Taler request: https://backend.demo.taler.net/instances/sandbox/config, GET
[2024-03-21 10:15:30] taler.DEBUG: Taler request headers: {"User-Agent":["Mirrorps_Taler_PHP"],"Authorization":["Bearer token"]}
[2024-03-21 10:15:31] taler.DEBUG: Taler response: 200, OK
[2024-03-21 10:15:31] taler.DEBUG: Taler response headers: {"Content-Type":["application/json"]}
[2024-03-21 10:15:31] taler.DEBUG: Taler response body: {"version":"0.8.0","name":"taler-exchange"}

Custom Logger

If you want to implement your own logger, it must implement Psr\Log\LoggerInterface.

Caching

The TalerPHP SDK supports caching through PSR-16 SimpleCache interface. You can provide any PSR-16 compatible cache implementation to store API responses and reduce unnecessary network requests.

Basic Cache Setup

use Symfony\Component\Cache\Adapter\FilesystemAdapter;
use Symfony\Component\Cache\Psr16Cache;

// Create a PSR-16 cache implementation
$filesystemAdapter = new FilesystemAdapter();
$cache = new Psr16Cache($filesystemAdapter);

// Initialize Taler with cache
$taler = Factory::create([
    'base_url' => 'https://backend.demo.taler.net/instances/sandbox',
    'token'    => 'Bearer token',
    'cache'    => $cache
]);

Using Cache with API Calls

You can enable caching for specific API calls using the cache() method. The method accepts:

minutes: How long to cache the response (in minutes)
cacheKey: (Optional) Custom cache key. If not provided, one will be generated automatically

Example: Caching Merchant Backend Configuration

// Cache the merchant backend configuration for 60 minutes
$config = $taler->cache(60)
    ->configApi()
    ->getConfig();

// Use a custom cache key
$config = $taler->cache(60, 'merchant_config')
    ->configApi()
    ->getConfig();

// Subsequent calls within the TTL will return cached data
$cachedConfig = $taler->configApi()->getConfig();

// Force delete cached data
$taler->cacheDelete('merchant_config');

Cache Implementation Requirements

If you want to implement your own cache, it must implement Psr\SimpleCache\CacheInterface.

Security notes

Do not enable DEBUG logging in production
- Keep debugLoggingEnabled set to false in production. If you don’t need SDK logs, omit the logger entirely for zero overhead.
Never include credentials in the base URL
- Avoid userinfo (user:pass@) and secrets in query strings. Pass tokens via headers (e.g., Authorization) and configuration.
Configure timeouts, TLS verification, and redirect policy in the injected HTTP client
- Always set timeout and connect_timeout. Ensure TLS verification is ON (e.g., Guzzle verify => true or a CA bundle path). Limit redirects and restrict to HTTPS only (see example above).
Avoid caching responses containing sensitive data
- If you use the PSR-16 cache integration, do not cache endpoints that may include tokens. Prefer short TTLs and explicit cache keys; clear cached entries promptly when no longer needed.

Using TalerPHP in WordPress

You can integrate the SDK into WordPress either from a theme or (recommended) from a dedicated plugin.

Install the SDK with Composer

Install mirrorps/taler-php in a location that WordPress can autoload:

cd wp-plugins
mkdir taler-payments && cd taler-payments
composer require mirrorps/taler-php

Make sure your plugin (or theme) loads Composer’s autoloader:

// In plugins/taler-payments/taler-payments.php
require_once __DIR__ . '/vendor/autoload.php';

If your Composer setup lives elsewhere (for example at the WordPress root), adjust the path accordingly (e.g. require_once ABSPATH . '../vendor/autoload.php';).

Store secrets such as the backend URL and access token in environment variables or wp-config.php (constants), not in your plugin code.

Minimal plugin: shortcode-based “Pay with Taler” button

Create a plugin file at plugins/taler-payments/taler-payments.php:

<?php
/**
 * Plugin Name: Taler Payments
 * Description: Simple integration of the TalerPHP SDK.
 * Version: 0.1.0
 */

if (! defined('ABSPATH')) {
    exit;
}

// Adjust the path if your composer.json is located elsewhere.
require_once __DIR__ . '/vendor/autoload.php';

use Taler\Factory\Factory;
use Taler\Api\Order\Dto\OrderV0;
use Taler\Api\Order\Dto\PostOrderRequest;
use Taler\Api\Order\Dto\CheckPaymentUnpaidResponse;

/**
 * Lazily create and reuse a Taler client.
 */
function taler_wp_client(): \Taler\Taler
{
    static $client = null;

    if ($client === null) {
        // Configure via environment variables or wp-config.php constants.
        $baseUrl = getenv('TALER_BASE_URL') ?: (defined('TALER_BASE_URL') ? TALER_BASE_URL : '');
        $token   = getenv('TALER_TOKEN') ?: (defined('TALER_TOKEN') ? TALER_TOKEN : '');

        $client = Factory::create([
            'base_url' => $baseUrl,
            'token'    => $token, // e.g. "Bearer abc..."
        ]);
    }

    return $client;
}

/**
 * Shortcode: [taler_pay_button amount="EUR:5.00" summary="Donation"]
 *
 * Renders a “Pay with GNU Taler” link that the wallet can use.
 */
function taler_wp_render_pay_button($atts): string
{
    $atts = shortcode_atts(
        [
            'amount'  => 'EUR:5.00',
            'summary' => 'Donation',
        ],
        $atts,
        'taler_pay_button'
    );

    $taler       = taler_wp_client();
    $orderClient = $taler->order();

    $order = new OrderV0(
        summary: sanitize_text_field($atts['summary']),
        amount: sanitize_text_field($atts['amount']),
        fulfillment_message: 'Thank you for your purchase. Your order will be fulfilled after payment.'
    );

    $request = new PostOrderRequest(order: $order);

    try {
        // 1) Create order and get its ID
        $created = $orderClient->createOrder($request);

        // 2) Fetch unpaid order status, including taler_pay_uri
        $status = $orderClient->getOrder($created->order_id);

        if ($status instanceof CheckPaymentUnpaidResponse && $status->taler_pay_uri !== null) {
            return sprintf(
                '<a href="%s" class="taler-pay-button">Pay with GNU Taler</a>',
                $status->taler_pay_uri
            );
        }

        return '<!-- Taler: order created but no unpaid status/pay URI available. -->';
    } catch (\Taler\Exception\TalerException $e) {
        if (defined('WP_DEBUG') && WP_DEBUG) {
            return '<!-- Taler error: ' . esc_html($e->getMessage()) . ' -->';
        }

        return '<!-- Taler payment temporarily unavailable. -->';
    } catch (\Throwable $e) {
        return '<!-- Taler runtime error. -->';
    }
}

add_shortcode('taler_pay_button', 'taler_wp_render_pay_button');

Usage inside posts, pages, or blocks:

[taler_pay_button amount="EUR:12.50" summary="Coffee Beans 1kg"]

The shortcode:

Creates a Taler order using the SDK’s Order API.
Retrieves the unpaid status to obtain the taler_pay_uri.
Renders a link that compatible Taler wallets can use to start the payment flow. You can further adapt this example to:
Redirect to a custom thank-you page after payment confirmation using the Order status API.
Log or persist WordPress-side order metadata alongside the Taler order_id.
Add styling for .taler-pay-button via your theme or plugin CSS.

Using TalerPHP in Drupal

You can integrate the SDK into Drupal (9/10/11) via a small custom module that uses the Drupal service container.

Install the SDK with Composer

From your Drupal project root (where composer.json lives):

cd /path/to/drupal
composer require mirrorps/taler-php

Drupal will automatically pick up the SDK through Composer’s autoloader; no manual require is needed.

Store secrets such as the backend URL and access token in environment variables (.env) or settings.php, not directly in module code.

Create a minimal `taler_payments` module

Create the module directory:

mkdir -p web/modules/custom/taler_payments

Or, if your Drupal root is not web/, adjust the path accordingly (for example modules/custom/taler_payments).

1) Module info file

Create web/modules/custom/taler_payments/taler_payments.info.yml:

name: 'Taler Payments'
type: module
description: 'Simple integration of the TalerPHP SDK.'
core_version_requirement: '^9 || ^10 || ^11'
package: 'Payments'

2) Service definition: shared Taler client

Create web/modules/custom/taler_payments/taler_payments.services.yml:

services:
  taler_payments.client:
    class: Taler\Taler
    factory: ['Drupal\taler_payments\Factory\TalerClientFactory', 'create']

Now create the factory at web/modules/custom/taler_payments/src/Factory/TalerClientFactory.php:

<?php

namespace Drupal\taler_payments\Factory;

use Taler\Factory\Factory;
use Taler\Taler;

/**
 * Factory for creating the shared Taler client used in Drupal.
 *
 * This reads configuration from environment variables so we don't rely on
 * Symfony-style %env()% placeholders in Drupal's container.
 */
final class TalerClientFactory {

  /**
   * Create the Taler client instance.
   */
  public static function create(): Taler {
    $baseUrl = getenv('TALER_BASE_URL') ?: 'https://backend.demo.taler.net/instances/sandbox';
    $token = getenv('TALER_TOKEN') ?: '';

    return Factory::create([
      'base_url' => $baseUrl,
      'token' => $token,
    ]);
  }

}

Configure environment

Make sure your web/PHP environment exports:

TALER_BASE_URL – your Taler backend instance (e.g. sandbox)
TALER_TOKEN – your bearer token for that instance, e.g. Bearer <real-token>

3) Route for a “Pay with Taler” page

Create web/modules/custom/taler_payments/taler_payments.routing.yml:

taler_payments.pay_page:
  path: '/taler/pay'
  defaults:
    _controller: '\Drupal\taler_payments\Controller\TalerPayController::pay'
    _title: 'Pay with GNU Taler'
  requirements:
    _permission: 'access content'

4) Allow the `taler://` URI scheme

By default, Drupal considers only a few URI schemes safe; taler:// is not one of them. Add a small .module file to allow it.

Create web/modules/custom/taler_payments/taler_payments.module:

<?php

/**
 * @file
 * Hooks and callbacks for the Taler Payments module.
 */

/**
 * Implements hook_allowed_protocols_alter().
 *
 * Ensure Drupal treats the "taler" URI scheme as safe so that links to
 * taler://pay/... are not stripped or rewritten.
 */
function taler_payments_allowed_protocols_alter(array &$protocols): void {
  if (!in_array('taler', $protocols, TRUE)) {
    $protocols[] = 'taler';
  }
}

5) Controller that uses the SDK

Create web/modules/custom/taler_payments/src/Controller/TalerPayController.php:

<?php

namespace Drupal\taler_payments\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Taler\Taler;
use Taler\Api\Order\Dto\OrderV0;
use Taler\Api\Order\Dto\PostOrderRequest;
use Taler\Api\Order\Dto\CheckPaymentUnpaidResponse;

class TalerPayController extends ControllerBase {

  /**
   * @var \Taler\Taler
   */
  protected Taler $taler;

  public function __construct(Taler $taler) {
    $this->taler = $taler;
  }

  public static function create(ContainerInterface $container): self {
    return new self(
      $container->get('taler_payments.client')
    );
  }

  /**
   * Simple "Pay with GNU Taler" page.
   */
  public function pay(): array {
    $orderClient = $this->taler->order();

    $order = new OrderV0(
      summary: 'Donation',
      amount: 'KUDOS:5.00', // adjust to your backend configuration
      fulfillment_message: 'Thank you for your donation. Your order will be fulfilled after payment.'
    );

    $request = new PostOrderRequest(order: $order);

    try {
      // 1) Create order and get its ID.
      $created = $orderClient->createOrder($request);

      // 2) Fetch unpaid order status, including taler_pay_uri.
      $status = $orderClient->getOrder($created->order_id);

      if ($status instanceof CheckPaymentUnpaidResponse && $status->taler_pay_uri !== null) {
        // Render a direct taler:// link without going through Drupal's Url
        // validators, since taler:// is a special wallet URI.
        $uri = $status->taler_pay_uri;
        $safe_uri = htmlspecialchars($uri, ENT_QUOTES, 'UTF-8');

        $link = '<a href="' . $safe_uri . '" class="taler-pay-button">'
          . $this->t('Pay with GNU Taler')
          . '</a>';

        // Mark the link as safe, since it comes from a trusted Taler backend.
        return [
          '#markup' => Markup::create($link),
        ];
      }

      return [
        '#markup' => $this->t('Taler order created, but no unpaid status is available.'),
      ];
    }
    catch (\Taler\Exception\TalerException $e) {
      // In production, you might log this instead of showing details.
      return [
        '#markup' => $this->t('Taler payment temporarily unavailable.'),
      ];
    }
    catch (\Throwable $e) {
      return [
        '#markup' => $this->t('An unexpected error occurred.'),
      ];
    }
  }

}

6) Enable and test

Clear caches (via Drush or UI):

UI: Admin → Configuration → Development → Performance and click “Clear all caches”.

Enable the module:

Go to Admin → Extend.
Enable “Taler Payments” (under “Payments”).

Test the payment page:

Visit:

/taler/pay - With valid TALER_BASE_URL, TALER_TOKEN, and the correct amount currency:
- The controller should:
  - Create an order via the TalerPHP SDK.
  - Fetch its unpaid status (including taler_pay_uri).
  - Render a “Pay with GNU Taler” link with a taler://pay/... URI, which a Taler wallet can use.

If you see an error like Unexpected response status code: 401, this indicates the Taler backend rejected the request (e.g. invalid token); double-check TALER_TOKEN and TALER_BASE_URL configuration.

Running Tests

To run the test suite:

composer install
php vendor/bin/phpunit

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

Security Note: SSRF Risk

The TalerPHP SDK allows developers to make HTTP requests to arbitrary endpoints based on configuration and API usage. If your application accepts or processes user-provided endpoints, you should be aware of the risk of Server-Side Request Forgery (SSRF).

License

This project is licensed under the MIT License. See LICENSE for details.

Support

If you have questions or need help, open an issue or start a discussion on the repository.

Acknowledgments

GNU Taler
All contributors and the open source community

Funding

This project is funded through NGI TALER Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet program. Learn more at the NLnet project page.

mirrorps / taler-php

Maintainers

Details

README

Features

Prerequisites

Supported Taler protocol versions

Installation

Usage

Factory-managed authentication (no pre-existing token)

Retrieve and persist the managed token

Configuration

Basic Example

Using Custom HTTP Client

Security: Timeouts and Redirect Policies (Important)

Backend validation and protocol versioning

Payment processing (Order API)

Basic Setup

Available Methods

Create Order

Handle errors for Create Order

Get Order Status

Get Orders History

Refund Order

Handle errors for Refund Order

Delete Order

Forget Order

Asynchronous Operations

Error Handling

Inspect structured error details (TalerException::getResponseDTO)

Response Types

Config API

Basic Setup

Get Merchant Config

Credential Health Check

Inventory

Basic Setup

Categories

Get Categories

Get Category

Create Category

Update Category

Delete Category

Products

Get Products

Get Product

Create Product

Update Product

Delete Product

POS Configuration

Lock Product Quantity

Raw Array Response

Asynchronous Operations

Tracking Wire Transfers

Basic Setup

Get Transfers

Asynchronous

Raw Array Response

Delete Transfer

Bank Accounts

Basic Setup

Create Bank Account

Get Bank Accounts

Get Bank Account

Update Bank Account

Delete Bank Account

Asynchronous Operations

OTP Devices

Basic Setup

Create OTP Device

Update OTP Device

Get OTP Device

Get OTP Devices

Delete OTP Device

Asynchronous

Templates

Basic Setup

Create Template

Update Template

Get Templates

Create a minimal `taler_payments` module

4) Allow the `taler://` URI scheme