Use the specific LibraryItemsAddedPayload / LibraryItemsRemovedPayload / LibraryItemsModifiedPayload; all three share this shape.
LibraryItemsAddedPayload
LibraryItemsRemovedPayload
LibraryItemsModifiedPayload
Deprecated
Use the specific
LibraryItemsAddedPayload/LibraryItemsRemovedPayload/LibraryItemsModifiedPayload; all three share this shape.