Developers should be aware of several breaking changes. The postId parameter, previously available in commentThreads.list to filter by post, has been removed. Correspondingly, the postId property is no longer present in the CommentSnippet and CommentThreadSnippet schemas. Applications relying on this field will need to update.
Furthermore, the favorite and like activity types, along with their corresponding properties in ActivityContentDetails and the ActivityContentDetailsFavorite and ActivityContentDetailsLike schemas, have been completely removed. The ActivitySnippet.properties.type enum no longer includes like and favorite as valid types.
Conversely, the subscription property within ActivityContentDetails and the ActivityContentDetailsSubscription schema are no longer marked as deprecated, indicating continued support for this activity type. Several descriptions for various enum values and parameters have also been clarified.