The maximum number of custom Item Specifics allowed when you list an item. Also the maximum returned per category in GetCategorySpecifics and GetItemRecommendations.
See the Field Index to learn which calls use MaxItemSpecificsPerItem.
Gives the time in GMT that the feature flags for the details were last updated. This timestamp can be used to determine if and when to refresh cached client data.
See the Field Index to learn which calls use UpdateTime.