Letterbook Docs
Connect an internal API
Expose safe server-side actions for account updates, entitlement checks, and operational workflows.
Last updated June 17, 2026
What this guide covers
Connect narrow internal API endpoints so Letterbook can check or update account data without unrestricted system access.
Setup steps
- Choose narrow, support-safe endpoints
- Define input and output schemas
- Add authentication
- Log every action
- Require approval for destructive actions
Guardrails
- Read-only endpoints by default
- Idempotency keys for actions
- Clear error messages for support agents
- Rate limits and retries