Customer.io Webhooks & Events

Overview

Implement webhook handling for Customer.io events including email delivery, opens, clicks, bounces, and data warehouse streaming.

Prerequisites

• Public endpoint for webhooks
• Webhook signing secret from Customer.io
• Event processing infrastructure

Instructions

Step 1: Define Webhook Event Types

Create TypeScript interfaces for all webhook event types (email, push, SMS, in-app) with full payload typing.

Step 2: Build Webhook Handler with Signature Verification

Implement HMAC-SHA256 signature verification using crypto.timingSafeEqual and event routing by metric type.

Step 3: Set Up Express Router

Configure Express with raw body parsing for signature verification and route webhook requests to the handler.

Step 4: Add Event Queue for Reliability

Use BullMQ with Redis to queue webhook events for reliable processing with retries and exponential backoff.

Step 5: Integrate Reporting API

Query Customer.io's Reporting API for delivery metrics and campaign performance data.

Step 6: Stream to Data Warehouse

Forward webhook events to BigQuery (or your data warehouse) for analytics and reporting.

For detailed implementation code and configurations, load the reference guide: Read(${CLAUDE_SKILL_DIR}/references/implementation-guide.md)

Output

• Webhook event type definitions
• Signature verification handler
• Express router setup
• Event queue for reliability
• Reporting API integration
• Data warehouse streaming

Error Handling

Resources

• Webhooks Documentation
• Reporting API

Next Steps

After webhook setup, proceed to customerio-performance-tuning for optimization.

Examples

Basic usage: Apply customerio webhooks events to a standard project setup with default configuration options.

Advanced scenario: Customize customerio webhooks events for production environments with multiple constraints and team-specific requirements.