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Where OpenAPI fits
An API contract shared between your application and another vendor.
When to choose another approach
A specification does not guarantee implementation accuracy or automatic freshness. Generated clients still need release/version ownership.
Worked example and evidence
Fictional contract: POST /orders accepts { externalId, items } and returns { orderId, status }. Document authorization, invalid items and duplicate externalId. Generate a client from the approved version and review breaking changes before release.
What you need to supply
Endpoint specification, sandbox, credentials, sample payloads, error codes, rate limits and change contact.
What acceptance should demonstrate
Compare implemented requests/responses with the contract, build a consuming client and verify errors plus duplicate handling.
Running costs and responsibilities
Assign schema reviews, generated-client updates, deprecation notice and integration monitoring.
Technical scope to confirm
OpenAPI describes HTTP interfaces. A maintained contract/release workflow keeps documentation aligned with code.
A proposal should identify the systems and data, direction of sync, access feasibility, failure handling, named owners and included deliverables. Listing this technology does not imply a prebuilt connector, vendor partnership or included feature.
What must another vendor supply to integrate?
A current specification, access/sandbox, representative payloads, authentication and limits, event/retry rules, and a named technical contact. Record gaps before estimating.