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Event Service

Overview​

The Event Service processes inbound webhook notifications from payment processors using the PHP SDK. Instead of polling for status updates, webhooks deliver real-time notifications when payment states change.

Business Use Cases:

  • Payment completion - Receive instant notification when payments succeed
  • Failed payment handling - Get notified of declines for retry logic
  • Refund tracking - Update systems when refunds complete
  • Dispute alerts - Immediate notification of new chargebacks

Operations​

OperationDescriptionUse When
handleEventProcess webhook from payment processor. Verifies and parses incoming connector notifications.Receiving webhook POST from Stripe, Adyen, etc.

SDK Setup​

use OrchestratorXPrism\EventClient;

$eventClient = new EventClient([
    'connector' => 'stripe',
    'apiKey' => 'YOUR_API_KEY',
    'environment' => 'SANDBOX'
]);

Common Patterns​

Webhook Processing Flow​

sequenceDiagram
    participant PP as Payment Provider
    participant App as Your Webhook Endpoint
    participant CS as Prism (EventClient)

    Note over PP: Payment state changes
    PP->>App: POST webhook payload
    App->>CS: handleEvent(payload, headers)
    CS->>CS: Verify signature
    CS->>CS: Parse and transform
    CS-->>App: Return structured event
    App->>App: Update order status
    App-->>PP: 200 OK response

Flow Explanation:

  1. Provider sends - When a payment updates, the provider sends a webhook to your endpoint.

  2. Verify and parse - Pass the raw payload to handleEvent for verification and transformation.

  3. Process event - Receive a structured event object with unified format.

  4. Update systems - Update your database, fulfill orders, or trigger notifications.

Webhook Security Example​

<?php
// webhook-handler.php
use OrchestratorXPrism\EventClient;

$eventClient = new EventClient([
    'connector' => 'stripe',
    'apiKey' => 'YOUR_API_KEY'
]);

$payload = file_get_contents('php://input');
$headers = getallheaders();

try {
    $event = $eventClient->handleEvent([
        'payload' => $payload,
        'headers' => $headers,
        'webhookSecret' => 'whsec_xxx'
    ]);

    if ($event['type'] === 'payment.captured') {
        // Fulfill order
        fulfillOrder($event['data']['merchantTransactionId']);
    }

    http_response_code(200);
    echo 'OK';
} catch (Exception $e) {
    http_response_code(400);
    echo 'Error: ' . $e->getMessage();
}

Next Steps​