Friday, May 15, 2026


Starting on June 15, 2026, the Google Ads API will no longer accept new adopters of offline conversion imports, including enhanced conversions for leads. As with our previous announcements for [session attributes and IP address](https://developers.google.com/ads/blog/posts/2026/01/changes-to-ip-address-and-session.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=readmore-saipblogpost), and [Customer Match](https://developers.google.com/ads/blog/posts/2026/03/changes-to-customer-match-support-in.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=readmore-cmblogpost), [Data Manager API](https://developers.google.com/data-manager/api/devguides/events/google-ads/offline.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=tryitout-dmapimigrationguide) is now the primary API for importing offline conversions.


Developers who have not adopted offline conversion imports or Enhanced conversion for leads, or have not imported offline conversions between December 2025 and May 2026, will receive an error if they attempt to import offline conversions. Developers who have already adopted offline conversions or Enhanced conversions for leads can continue importing using the Google Ads API while they integrate with the Data Manager API.


See our [migration guide for Google Ads API users](https://developers.google.com/data-manager/api/devguides/events/google-ads/offline.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=tryitout-dmapimigrationguide) to start integrating with the Data Manager API.


**Technical details**

- Developers will be allowlisted by their [developer token](https://developers.google.com/google-ads/api/docs/get-started/make-first-call.md.txt#developer-token?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=readmore-developer-token).
- Once this change is rolled out, new adopters will receive the error `CUSTOMER_NOT_ALLOWLISTED_FOR_THIS_FEATURE` when attempting to use the `ConversionUploadService.UploadClickConversions` method.
- See the [documentation](https://developers.google.com/data-manager/api/devguides/events/google-ads/offline.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=readmore-conversionsguide) for integrating with the Data Manager API for offline conversion imports for Google Ads API users.

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Reach out to the [Google Ads API support](https://developers.google.com/google-ads/api/support.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=support-gaapi) or [Data Manager API support](https://developers.google.com/data-manager/api/support.md.txt?utm_source=googleblog-adsdevs&utm_medium=blog&utm_campaign=adr-ociallowlist&utm_content=support-dmapi) channels if you have any questions.


If you have any questions or want to discuss this post, please reach out to us on our ["Google Advertising and Measurement Community" Discord server](http://goo.gle/ads-and-measurement-discord).

![Portrait of the author](https://developers.google.com/static/ads/blog/images/AOh14GhFLgYJAFpYHUS1kBcLzMIT2gKkUyYcjWCuOWM3=s600-p.jpg) - Ben Karl, on behalf of the Google Ads API Team


**Labels:**

[data-manager-api](https://developers.google.com/ads/blog/feeds/labels/data-manager-api.md.txt),

[enhanced-conversions-for-leads](https://developers.google.com/ads/blog/feeds/labels/enhanced-conversions-for-leads.md.txt),

[google-ads](https://developers.google.com/ads/blog/feeds/labels/google-ads.md.txt),

[google-ads-api](https://developers.google.com/ads/blog/feeds/labels/google-ads-api.md.txt),

[offline-conversions](https://developers.google.com/ads/blog/feeds/labels/offline-conversions.md.txt)