Polygon Criterion, (also referred to as custom shapes, multi-point or polygon targets) was deprecated in 2011. They are now sunset in AdWords as we had previously announced. Until recently, developers were able to retrieve and individually delete any old polygon targets, using Adwords API.

As of now, all the polygon targets in Adwords campaigns have been deleted. You can continue to retrieve any accumulated stats of previous polygon targets using Geo Performance Report.

Please use other location targeting features available in Adwords for your campaigns.
As always, please feel free to ask any questions regarding AdWords API on our forum for AdWords API. You can also follow the Google Ads Developer page for all Ads-related updates.

- Takeshi Hagikura, AdWords API Team