Shortly after the 
release of AdWords API v201802, review extensions will be sunset from both 
extension settings services and 
feed services for 
all API versions.
What will happen?
For extension settings services (
AdGroupExtensionSettingService, 
CampaignExtensionSettingService, 
CustomerExtensionSettingService):
  - You will not be able to create a new ReviewFeedItem using any of the extension settings services.
- No ReviewFeedItems will be returned for get()orquery()requests to any of the extension settings services.
For feed services (
FeedService, 
FeedItemService, 
FeedMappingService):
  - You will not be able to pass ID 8 to placeholderType of FeedMapping when creating a new feed mapping.
- Feeds, feed items and feed mappings related to review extensions will still be returned for get()orquery()requests to FeedService, FeedItemService and FeedMappingService, respectively.
For 
CampaignFeedService, 
AdGroupFeedService and 
CustomerFeedService:
  - You will not be able to pass ID 8 to placeholderType of CampaignFeed, AdGroupFeed or CustomerFeed.
- All CampaignFeed,AdGroupFeedandCustomerFeedthat are associated with review extensions (have ID 8 in their placeholderTypes) will not be returned forget()orquery().
Note that you can still find historical stats for your review extensions after the sunset in  
PLACEHOLDER_REPORT and 
PLACEHOLDER_FEED_ITEM_REPORT.
What should you do?
If you have code that retrieves, adds or updates review extensions using any services above, please review your code before March 1 to ensure that the changes above won’t have a negative impact on your application.
As always, if you have any questions, please post on the 
forum.
 - Thanet Praneenararat, AdWords API Team
 - Thanet Praneenararat, AdWords API Team