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Webhooks allow you to receive real-time notifications when the status of a transaction changes (e.g., when a user approves a payment prompt).

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Configuring Webhooks

You can configure your Webhook URL in the PayX Dashboard under Developer Settings. Once configured, PayX will send a POST request to your URL whenever a transaction is completed or failed.

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Payload Structure

The webhook payload is a JSON object containing the transaction details. 
{
  "event": "transaction.success",
  "data": {
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "amount": 10.0,
    "currency": "GHS",
    "status": "SUCCESSFUL",
    "reference": "your_custom_reference",
    "customer": {
      "phone": "0551234987",
      "network": "MTN"
    }
  }
}

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Security

To ensure that a webhook was actually sent by PayX, you should verify the signature. PayX includes an x-payx-signature header in every request. This is an HMAC-SHA256 hash of the request body, signed with your Webhook Secret.

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Verifying Signatures (Node.js SDK)

If you are using the payx-node SDK, verifying signatures is straightforward: 
const { PayX } = require('payx-node');
const payx = new PayX({ apiKey: '...' });

// Express.js Example
app.post('/webhooks', (req, res) => {
  const signature = req.headers['x-payx-signature'];
  const secret = 'your_webhook_secret_from_dashboard';
  
  const isValid = payx.webhooks.verifySignature(
    JSON.stringify(req.body), 
    signature, 
    secret
  );

  if (!isValid) {
    return res.status(401).send('Invalid Signature');
  }

  // Process the event...
  console.log('Event received:', req.body.event);
  res.status(200).send('OK');
});