Authentication and secure environments
Use API keys with rotation and egress IP allowlists where possible. Never expose secrets in client-side code.
Separate staging and production credentials and monitor access patterns.
Outbound messages and templates
Many proactive messages require approved templates with dynamic parameters. Map your domain fields to template placeholders.
Inbound webhooks
Expose a valid HTTPS endpoint and verify event signatures. Store message IDs to track delivery and read receipts.
End-to-end testing before launch
Exercise flows in the sandbox first, then ramp traffic in production with structured logging and retries.