On June 30, 2025, the Marketo Engage REST API will no longer accept access tokens for authentication and authorization via the ‘access_token’ query parameter. To avoid any disruptions of service, any services using this parameter to authenticate will need to migrate to using a header-based authentication instead. When updating, you can use the ‘Authorization’ header rather than the access_token query parameter. The migration process is documented here.

The Marketo Engage SOAP API will be fully deprecated on October 31, 2025. To prevent any disruptions of service, you will need to retire or migrate any services using the SOAP API to the Marketo Engage REST API. For more information on these changes, please review this migration guide.

As we approach these important dates mentioned above, please ensure your team has updated any Marketo Engage integrations to ensure uninterrupted service. The migration guidelines provided have detailed instructions for both REST API and SOAP API changes, ensuring a smooth transition.