As we announced  in January and again  in March, existing and future Smart Shopping campaigns  (SSC) will automatically upgrade to Performance Max  campaigns between July and September 2022. The self-upgrade started in April 2022. The automatic upgrade has commenced  (related blog post ) and should complete by September 30, 2022. This blog post adds details for our API developers. 
Starting July 25, 2022, accounts without  active or paused SSCs (including new accounts) will no longer be able to create SSCs.
Once an account with  active or paused SSCs has been automatically upgraded from SSC to Performance Max, no new SSC creation will be permitted in any surface including the UI , the API , Google Ads Scripts  or Google Ads Editor .
The Google Ads API v11 included a new UpgradeSmartShoppingCampaignToPerformanceMaxRecommendation 
As mentioned in the January blog post , Local campaigns will also be automatically upgraded to Performance Max. An upcoming release of the Google Ads API will include a new recommendation type to allow developers to upgrade an eligible Local campaign  to a Performance Max campaign.
Additional information 
If you have any questions or need additional help, contact us via the forum .
David Wihl , Google Ads API Team