Now that all existing legacy Product Listing Ads campaigns have been upgraded to Shopping campaigns, some cleanup is in order. On March 23, 2015, we'll be removing criteria and ad objects related to AdWords legacy PLA campaigns, specifically:

• All AdGroupCriterion objects for Product criteria (Product Targets):
  • Criteria that accrued impressions will be marked REMOVED. These objects will continue to appear in API reports in v201406 and v201409.
  • Criteria that did not accrue impressions will be permanently deleted. These objects will no longer appear in API reports.
• All ProductAd objects for legacy Product Listing Ads campaigns will be marked DISABLED. These objects will continue to appear in API reports in v201406 and v201409, regardless of whether or not they accrued impressions.

Actions required

If you are interested in capturing the components of legacy Product Listing Ads campaigns that did not accrue impressions, retrieve that information before March 2015 using the appropriate services (e.g., AdGroupCriterionService, AdGroupAdService).

Learn more

If you haven't started using Shopping campaigns, check out the following resources.

• Introduction to Shopping campaigns
• Shopping campaigns API guide
• API guide for transitioning to Shopping campaigns

Still have questions? Feel free to visit us on the AdWords API Forum or our Google+ page.

- Josh Radcliff, AdWords API Team

Source: Google Ads Developer Blog