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The full OpenAPI description is served live and unauthenticated, so you can generate a client or import it into Postman without a key. It comes in two forms.

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The version-resolving URL

Served without a key, so it has no account default to fall back on: pass ?version=YYYY-MM-DD (or the Clemta-Version header) to pin a version, otherwise it serves the latest. Use this when you always want the description that matches the contract you call.

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Frozen, dated URLs

Each dated version is also served at its own stable path. These never change once published, so they are safe to vendor into a build. Download one with curl:
See API versions for each version’s lifecycle status and Versioning for how pinning works.