2025-09-02 · Elias Navarro

Validating API contracts before partner onboarding

Partner integrations fail quietly when contracts drift from consumer expectations. The failure shows up as support tickets, not build errors.

Start with consumer journey mapping: which fields are required for the happy path, which are diagnostic only, and which should never leak across trust boundaries. Then diff your published schema against actual traffic samples from staging.

Versioning policy should be written before the second breaking change, not after. We recommend a explicit deprecation window and a machine-readable changelog that CI can gate on.

We do not advocate maximal breaking-change detection on day one. Start with compatibility checks on critical endpoints, expand coverage as your release cadence stabilizes.

#architecture#apis

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