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Advanced Usage

Processing Different Event Types​

app.post('/webhook', (req, res) => {
  try {
    const result = sdk.getEventFromRequest(req, WEBHOOK_SECRET);

    if (!result.isValid) {
      return res.status(400).json({ error: result.error });
    }

    const payload = result.payload;

    // Process based on event type
    if (payload.event.name === 'Transfer') {
      handleTransferEvent(payload);
    } else if (payload.event.name === 'Approval') {
      handleApprovalEvent(payload);
    } else {
      console.log('Unknown event type:', payload.event.name);
    }

    res.json({ received: true });
  } catch (error) {
    console.error('Webhook error:', error.message);
    res.status(500).json({ error: 'Internal server error' });
  }
});

function handleTransferEvent(payload) {
  const { from, to, value } = payload.event.args;
  console.log(`Transfer: ${from} -> ${to}, value: ${value}`);

  // Your business logic here
  // Examples: Save to database, send notifications, update UI, etc.
}

Error Handling​

const result = sdk.getEventFromRequest(req, WEBHOOK_SECRET);

if (!result.isValid) {
  console.error('Webhook validation failed:', result.error);
  return res.status(400).json({ error: result.error });
}

// Process verified event
const payload = result.payload;

Handling Retries​

MOUNTAIN will retry failed webhook deliveries. Ensure your endpoint is idempotent:

const processedEvents = new Set();

app.post('/webhook', (req, res) => {
  try {
    const result = sdk.getEventFromRequest(req, WEBHOOK_SECRET);

    if (!result.isValid) {
      return res.status(400).json({ error: result.error });
    }

    const payload = result.payload;

    // Check if we've already processed this event
    if (processedEvents.has(payload.id)) {
      console.log('Event already processed:', payload.id);
      return res.json({ received: true });
    }

    // Process the event
    processEvent(payload);

    // Mark as processed
    processedEvents.add(payload.id);

    res.json({ received: true });
  } catch (error) {
    console.error('Webhook error:', error.message);
    res.status(500).json({ error: 'Internal server error' });
  }
});

Next Steps​