Two upcoming deprecations may impact your integration with Marketo Engage and may require action. Previously, both the SOAP API, and the REST API Access Token in Query Parameter were to be deprecated on 31 October 2025. They will now be deprecated on 31 January 2026.
The Marketo Engage SOAP API will be fully deprecated on 31 January 2026. Please review if you are still using the SOAP API in one or more of your Marketo subscriptions. To avoid disruptions of service, you will need to retire or migrate any services using the SOAP API to the Marketo Engage REST API by 31 January 2026. Consult the Migration Guide for further information. Marketo Engage Support is only able to provide the IP address of requests made to the SOAP API.
On 31 January 2026, the Marketo Engage REST API will no longer accept access tokens for authentication and authorization via the ‘access_token’ query parameter. Please check if one or more of your integrations uses this parameter to authenticate. To avoid disruptions of service, any services using this parameter to authenticate will need to migrate to using header-based authentication using the ‘Authorization’ header, which is documented here.
Please let us know in the comments section if you have any questions or concerns about this upcoming change.
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