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Event Service

Overview​

The Event Service processes inbound webhook notifications from payment processors using the Python 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
handle_eventProcess webhook from payment processor. Verifies and parses incoming connector notifications.Receiving webhook POST from Stripe, Adyen, etc.

SDK Setup​

from orchestratorx_prism import EventClient

event_client = EventClient(
    connector='stripe',
    api_key='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: handle_event(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 handle_event 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​

Always verify webhooks before processing:

# Flask example
from flask import Flask, request

@app.route('/webhooks/payments', methods=['POST'])
async def handle_webhook():
    payload = request.get_data()
    headers = dict(request.headers)

    event = await event_client.handle_event({
        "payload": payload,
        "headers": headers,
        "webhook_secret": "whsec_xxx"
    })

    if event["type"] == "payment.captured":
        # Fulfill order
        await fulfill_order(event["data"]["merchant_transaction_id"])

    return "OK", 200

Next Steps​