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The Developer API uses date versions — 2026-08-22 is the current (and founding) version. When the API needs a breaking change (a renamed field, a reshaped response), that change ships as a new date; every older version keeps behaving exactly as it did. Additive changes — new endpoints, new optional fields — arrive in all versions and never mint a date.
You never have to chase the API. An integration built today keeps receiving today’s shapes until you decide to move — that is the whole point of the model.

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Your key is pinned

Every API key is pinned to the version that was current when the key was created. A request without a version header is served in the key’s pinned version, forever. The console’s API keys page shows each key’s pinned version in the API version column.

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Overriding per request

Send the Orriven-Version header to serve a single request in a different version — the way to test a newer version before committing to it:
An unknown date answers 400 and names the versions that exist. You cannot invent a version — only published dates are valid.

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Every response tells you its version

Whatever decided the version — your header or your key’s pin — the response echoes it back:
Log this header in your integration: when you read old logs during an upgrade, you will know exactly which shape each response was in.

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Upgrading

1

Read the changelog

Each new version’s entry (below) says exactly what changed, seen from the caller.
2

Test with the header

Point your staging integration at the new date with Orriven-Version — your key’s pin is untouched, production traffic keeps its old shape.
3

Move the pin

Generate a new key (it pins to the latest version automatically), switch your integration to it, then revoke the old key — the same zero-downtime rotation as any credential change.

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Changelog

API keys

Where a key’s pinned version lives.

Endpoint reference

The current version’s shapes, endpoint by endpoint.