The Check API is versioned! When backwards-incompatible changes are made to the API, a new, dated version is released.

See our API Changelog for a complete list of API versions and their changes.

To set the API version on a specific request, send a Check-Version header.

Check-Version: 2021-01-15

In addition, every Partner account has a default API version associated with it. If no version is specified on a request, the account's default API version will be used. An account's default API version starts out as the latest API version available when the account is created. We plan on allowing Partners to be able self-serve to modify the default API version set on their account in the near future; in the meantime, if you would like to modify your default API version, please contact support.