Starting the week of September 4, 2023, MerchantLinkService.MutateMerchantCenterLink method will fail with an AuthorizationError.ACTION_NOT_PERMITTED error for authorized users without Admin access levels.
If your application mutates Merchant Center links using the MutateMerchantCenterLink method, review the account permissions of the users authorizing API calls and update their permissions appropriately to ensure they have the required access levels. Refer to the help center guide for instructions.
This change will align the Google Ads API behavior with other products such as the Google Ads UI and Google Ads Editor, which only allow Administrator users to mutate Merchant Center links. Currently, the Google Ads API allows users with Standard Access levels but without Admin access level permissions to mutate Merchant Center links using the MerchantLinkService.
If you have any questions, please reach out to us on the forum.