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Webhook Troubleshooting Guide

Solutions to common webhook problems and debugging strategies.

Debugging Tools​

Dashboard Delivery Attempts​

The BlockEden dashboard provides powerful debugging tools:

  1. Navigate to Accept Payments → Webhooks
  2. Click on an endpoint to view its delivery attempts
  3. Expand any attempt to see:
    • Full request body sent by BlockEden
    • Full response body from your server
    • HTTP status code
    • Error messages
    • Response time
    • Retry schedule

Replay Failed Events​

Don't worry if a webhook delivery fails - you can replay it:

  1. Find the failed attempt in the dashboard
  2. Click Replay Event button
  3. The event will be resent immediately
  4. Check if it succeeds this time

Test Your Endpoint​

Use the Test button to send a sample event:

  1. Click Test on your endpoint
  2. A webhook.test.event is sent with sample data
  3. Verify your server receives and processes it correctly
  4. Check server logs and dashboard for results

Common Issues​

Issue: "Invalid Signature" (401 Unauthorized)​

Symptoms:

  • Your endpoint returns HTTP 401
  • Logs show "Invalid signature" or "Unauthorized"
  • All webhook deliveries fail with signature errors

Cause 1: Using Parsed JSON Instead of Raw Body

This is the most common mistake. You must verify the signature against the raw request body, not the parsed JSON.

Wrong
// <ion-icon name="close-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#ef4444"}}></ion-icon> WRONG - Body is already parsed and modified
app.use(express.json());
app.post('/webhooks', (req, res) => {
  const body = JSON.stringify(req.body); // This won't match!
  const signature = crypto
    .createHmac('sha256', secret)
    .update(body)
    .digest('hex');
  // Verification will fail
});
Correct
// <ion-icon name="checkmark-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#10b981"}}></ion-icon> CORRECT - Use raw body
app.post('/webhooks',
  express.raw({ type: 'application/json' }),
  (req, res) => {
    const body = req.body; // Raw Buffer
    const signature = crypto
      .createHmac('sha256', secret)
      .update(body)
      .digest('hex');
    // Verification will succeed
  }
);

Cause 2: Wrong Secret

You may be using an old secret or the wrong endpoint's secret.

Solution:

  1. Go to dashboard → Click Rotate Secret on your endpoint
  2. Copy the new secret immediately (it's only shown once)
  3. Update your environment variable: WEBHOOK_SECRET=your_new_secret
  4. Restart your server
  5. Click Test to verify it works

Cause 3: Whitespace or Encoding Issues

Ensure you're using the exact raw bytes without modification.

// Correct approach
const signature = crypto
  .createHmac('sha256', secret)
  .update(req.body) // Must be Buffer, not modified string
  .digest('hex');

Issue: Webhooks Timing Out​

Symptoms:

  • Dashboard shows "Timeout" errors
  • No response received after 30 seconds
  • Events are automatically retried

Cause 1: Endpoint Takes Too Long to Respond

Your handler is doing too much work synchronously.

Wrong
// <ion-icon name="close-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#ef4444"}}></ion-icon> WRONG - Slow synchronous processing
app.post('/webhooks', async (req, res) => {
  const event = parseAndVerify(req);

  // This takes 60 seconds - too slow!
  await processOrder(event);
  await sendEmails(event);
  await updateAnalytics(event);

  res.status(200).send('OK'); // Too late - already timed out
});
Correct
// <ion-icon name="checkmark-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#10b981"}}></ion-icon> CORRECT - Respond quickly, process async
app.post('/webhooks', async (req, res) => {
  const event = parseAndVerify(req);

  // Respond immediately (within 1 second)
  res.status(200).json({ received: true });

  // Process in background
  processWebhookAsync(event).catch(err => {
    console.error('Background processing error:', err);
    // Log to error tracking service
  });
});

async function processWebhookAsync(event) {
  // Heavy processing here
  await processOrder(event);
  await sendEmails(event);
  await updateAnalytics(event);
}

Cause 2: Endpoint Not Accessible

Your endpoint might be blocked by a firewall, behind a VPN, or using localhost.

Solutions:

  • Ensure endpoint is publicly accessible over the internet
  • Use HTTPS (HTTP is not supported)
  • Check cloud provider security groups allow inbound HTTPS
  • For local testing, use ngrok:
# Terminal 1: Start your server
npm start

# Terminal 2: Create secure tunnel
ngrok http 3000

# Output: Forwarding https://abc123.ngrok.io -> http://localhost:3000

# Use the ngrok HTTPS URL in BlockEden dashboard

Issue: Missing Webhooks​

Symptoms:

  • Some events aren't received
  • Expected webhook never arrived
  • Inconsistent delivery

Cause 1: Not Subscribed to Event Type

You're not subscribed to that specific event type.

Solution:

  1. Go to dashboard → Edit your endpoint
  2. Check the boxes for event types you want to receive
  3. Click Save

Cause 2: Endpoint Disabled

The endpoint was automatically disabled due to repeated failures.

Solution:

  1. Check if endpoint shows "Disabled" badge in dashboard
  2. Review failure reason in delivery attempts table
  3. Fix the underlying issue (signature, timeout, etc.)
  4. Click Edit → Toggle "Endpoint active" to re-enable
  5. Click Test to verify it works

Cause 3: Event Already Sent

BlockEden doesn't send duplicate events - this is correct behavior.

Solution: Each event is sent once per endpoint. Check your server logs or database to confirm if you actually processed it.

Issue: Duplicate Event Processing​

Symptoms:

  • Same order fulfilled twice
  • Customer charged multiple times
  • Duplicate database records

Cause: Not Implementing Idempotency

Your handler doesn't check if an event was already processed.

Wrong
// <ion-icon name="close-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#ef4444"}}></ion-icon> WRONG - No duplicate check
async function handleWebhook(event) {
  // Process immediately without checking
  await fulfillOrder(event.data.paymentId);
}
Correct
// <ion-icon name="checkmark-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#10b981"}}></ion-icon> CORRECT - Check before processing
async function handleWebhook(event) {
  // Check if already processed using event ID
  const existing = await db.webhookEvents.findOne({
    eventId: event.id
  });

  if (existing) {
    console.log('Event already processed:', event.id);
    return; // Skip duplicate
  }

  // Process the event
  await fulfillOrder(event.data.paymentId);

  // Mark as processed
  await db.webhookEvents.create({
    eventId: event.id,
    type: event.type,
    processedAt: new Date()
  });
}

Issue: "Connection Refused" Errors​

Symptoms:

  • Dashboard shows "Connection refused"
  • Error message: "Cannot connect to endpoint"
  • Immediate failure (not timeout)

Cause 1: Server Not Running

Your webhook server is down or crashed.

Solution:

  • Check your server is running: systemctl status your-service
  • Verify it's listening on the correct port
  • Check server logs for startup errors
  • Use process manager like PM2 or systemd for auto-restart

Cause 2: Wrong URL or Port

The webhook URL doesn't match your actual endpoint.

Solution:

  • Verify URL in dashboard matches your server
  • Check the path: /webhooks vs /webhook vs /api/webhooks
  • Ensure using HTTPS (HTTP not supported)
  • Test with curl:
curl -X POST https://your-domain.com/api/webhooks \
  -H "Content-Type: application/json" \
  -d '{"test":"data"}'

Cause 3: Firewall Blocking Requests

Corporate firewall or cloud security group is blocking inbound traffic.

Solution:

  • Allow incoming HTTPS traffic (port 443)
  • Check cloud provider security groups (AWS, GCP, Azure)
  • Verify network ACLs
  • Contact support for BlockEden IP ranges to whitelist

Issue: 500 Internal Server Error​

Symptoms:

  • Your endpoint returns HTTP 500
  • BlockEden automatically retries the event
  • Errors in your server logs

Cause 1: Unhandled Exception

Your code throws an error that crashes the request handler.

Wrong
// <ion-icon name="close-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#ef4444"}}></ion-icon> WRONG - Unhandled errors crash the handler
app.post('/webhooks', async (req, res) => {
  const event = parseAndVerify(req);
  await processEvent(event); // If this throws, 500 is returned
  res.status(200).send('OK');
});
Correct
// <ion-icon name="checkmark-circle" style={{verticalAlign: "middle", fontSize: "1.2em", color: "#10b981"}}></ion-icon> CORRECT - Proper error handling
app.post('/webhooks', async (req, res) => {
  try {
    const event = parseAndVerify(req);

    // Always return 200 first (even if processing fails)
    res.status(200).json({ received: true });

    // Process with error handling
    await processEvent(event);

  } catch (error) {
    console.error('Webhook processing error:', error);
    // Log to error tracking service (Sentry, Datadog, etc.)
    // Don't throw - webhook was already acknowledged
  }
});

Cause 2: Database Connection Error

Can't connect to your database.

Solution:

  • Check database is running and accessible
  • Verify connection string
  • Check network connectivity
  • Handle database errors gracefully:
try {
  await db.orders.create(orderData);
} catch (dbError) {
  console.error('Database error:', dbError);
  // Still return 200 - retry won't help DB issues
}

Issue: Events Out of Order​

Symptoms:

  • Receive payment.confirmed before payment.pending
  • Events arrive in unexpected sequence
  • State transitions seem wrong

Cause: Network Delays or Retries

Events may arrive out of order due to network conditions or retries.

Solution: Use Status Field, Not Event Order

Don't rely on event arrival order. Always check the current status:

async function handlePaymentEvent(event) {
  const payment = event.data;

  // Get current status from your database
  const existingPayment = await db.payments.findOne({
    id: payment.paymentId
  });

  // Only update if new status is "higher" than current
  const statusPriority = {
    'pending': 1,
    'confirmed': 2,
    'failed': 3,
    'refunded': 4
  };

  if (statusPriority[payment.status] > statusPriority[existingPayment.status]) {
    await db.payments.update(payment.paymentId, {
      status: payment.status,
      updatedAt: new Date()
    });
  } else {
    console.log('Ignoring older event:', event.type);
  }
}

Best Practices​

1. Always Verify Signatures​

Never skip signature verification:

const signature = req.headers['x-eden-signature'];
if (!verifySignature(req.body, signature, WEBHOOK_SECRET)) {
  return res.status(401).send('Unauthorized');
}

2. Return 200 Within 1 Second​

Acknowledge receipt immediately:

// Return 200 in < 1 second
res.status(200).json({ received: true });

// Process in background (can take minutes)
processAsync(event);

3. Handle Idempotency​

Prevent duplicate processing:

if (await alreadyProcessed(event.id)) {
  console.log('Duplicate event, skipping');
  return;
}

4. Log Everything​

Comprehensive logging helps debugging:

console.log('Webhook received:', {
  eventId: event.id,
  type: event.type,
  paymentId: event.data.paymentId,
  status: event.data.status,
  timestamp: new Date().toISOString()
});

5. Monitor Failures​

Set up alerts for webhook failures:

  • Check dashboard regularly
  • Set up alerts for high failure rates (>10%)
  • Replay failed events after fixing issues
  • Monitor success rate badge on endpoints

6. Handle Unknown Events​

New event types may be added in the future:

switch (event.type) {
  case 'payment.confirmed':
    await handlePaymentConfirmed(event.data);
    break;

  case 'payment.failed':
    await handlePaymentFailed(event.data);
    break;

  default:
    // Log but don't fail for unknown event types
    console.log('Unknown event type:', event.type);
}

Pre-Launch Testing Checklist​

Before going live, verify your webhook endpoint:

  • Can receive test webhook from dashboard
  • Signature verification works correctly
  • Returns 200 OK within 1 second
  • Logs event details for debugging
  • Handles unknown event types gracefully
  • Doesn't process same event twice (idempotency)
  • Works with production HTTPS URL
  • Error handling doesn't crash server
  • Background processing completes successfully
  • Database updates work correctly

Local Development Testing​

Using ngrok​

# Terminal 1: Start your development server
npm run dev

# Terminal 2: Create secure tunnel
ngrok http 3000

# Output:
# Forwarding https://abc123.ngrok.io -> http://localhost:3000

# Use the ngrok HTTPS URL in BlockEden dashboard

Using localtunnel​

# Start your server
npm start

# Create tunnel (no account needed)
npx localtunnel --port 3000

# Output: your url is: https://random-name.loca.lt

# Use this URL in BlockEden dashboard

Getting Help​

Dashboard Debugging​

Use the dashboard's built-in debugging tools:

  1. View Delivery Attempts - See full request/response details
  2. Check Failure Reasons - Understand why deliveries failed
  3. Replay Failed Events - Resend events after fixing issues
  4. Test Endpoint - Send sample events manually

Check Server Logs​

Always check your server logs for errors:

# For PM2
pm2 logs your-app-name

# For systemd
journalctl -u your-service-name -f

# For Docker
docker logs container-name -f

Contact Support​

If you're still stuck, contact support with:

Email: [email protected]

Include:

  • Endpoint ID from dashboard
  • Event ID (from failed delivery)
  • Error message from your server logs
  • Delivery attempt details from dashboard (screenshot)
  • Your webhook handler code (without secrets)

Response Time: Usually within 24 hours

Community Support​

Next Steps​

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