Starting with the OAuth token endpoint on Wednesday January 15th 2020 the Merchant API will start enforcing rate limits.
The issued tokens are valid for 24 hours and it is best practice to make use of the
expires_in property to take advantage of the lifetime of the token and avoid unnecessary calls to the OAuth2 token endpoint.
Given the growing interest in the Merchant API we will gradually extend rate limiting to other resources as the need arises.
See example access token response with
expires_in at https://developer.clearhaus.com/merchant-api/start/#supported-grants.