How APIs Should Be Designed for Secure Partner and Client Integrations

Design for least privilege

Issue scoped API keys or OAuth tokens per integration. Separate read and write permissions and rotate credentials on a schedule. Never expose internal IDs without access checks.

Versioning and deprecation

Prefix routes with a version and publish a deprecation policy. Give partners at least 90 days notice and changelog entries for breaking changes.

Observability and abuse prevention

Per-tenant rate limits, structured error codes, and webhook signing reduce fraud. Store request IDs and audit who changed what for compliance-heavy industries.