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Kenny_Elkington
Adobe Employee
Kenny_ElkingtonAdobe Employee
Adobe Employee
September 16, 2025
PinnedUpdate

Updates to Deprecation of SOAP API and Access Token in Query Parameter for REST API

  • September 16, 2025
  • 2 replies
  • 867 views

An upcoming deprecation may impact your integration with Marketo Engage and may require action.
 

The Marketo Engage SOAP API will be fully deprecated on August 31, 2026 (the REST API Access Token has already been deprecated).  Please review this post 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 August 31, 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 August 31, 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 change.

    2 replies

    MattVe3
    MattVe3
    Level 1
    January 20, 2026

    Has the SOAP deprecation date changed? This release notes article says it’s March 31st: https://experienceleague.adobe.com/en/docs/marketo/using/release-notes/current

    ss2026
    Level 2
    January 23, 2026

    Thanks for the heads-up. For anyone impacted, the key actions are:

    • Audit integrations now to identify any usage of the SOAP API or REST calls passing access_token in query parameters.

    • Migrate SOAP-based integrations to REST APIs well before 31 Jan 2026 to avoid service disruption.

    • Update REST integrations to use Authorization headers instead of query-string tokens.

    • Coordinate with vendors/partners early, since Marketo Support can only provide IP-level confirmation for SOAP usage.

    Teams with multiple legacy or third-party integrations often bring in partners like Miinfotech to run a full integration audit and handle SOAP→REST migration safely ahead of the deadline.

    Appreciate the advance notice from Adobe.

    saurabh from miinfotech.com
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