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API design: documenting authentication, errors, and versioning

An API contract should define authentication, authorization, payload validation, error formats, rate limits, versioning, and observability.

DATE October 30, 2025READING 4 min readCATEGORY Custom Software

Endpoints alone are not an integration plan.

API design succeeds when scope boundaries and failure paths are agreed before components are chosen or content is migrated.

Acceptance of API design should be demonstrated on the genuine path with real content, real accounts, and representative traffic rather than staged examples.

When scoping API design with stakeholders, bring the questions above plus the documentation below so decisions trace back to published platform behavior.

[ Sources ]

Official documentation, checked and cited.

Terminology and platform behavior in this note trace back to published docs, not secondhand summaries.