WhatsApp Embedded Signup Webhooks Checklist

Use this checklist before enabling coexistence onboarding in production.

• Subscribe to coexistence-related fields (`history`, state sync, and message echoes).
• Validate signature and enforce secure webhook endpoint policies.
• Capture payloads first; process asynchronously for high-volume history chunks.
• Track request IDs and event IDs for observability and replay workflows.
• Set alerts for webhook ingestion failures and delayed processing windows.