The ItemID of the item that is to be added to the watch list. The item must be a currently active item, and the total number of items in the watchlist (after the items in the request have been added) cannot exceed the maximum allowed number of watch list items. One or more ItemID fields can be specified. A separate error node will be returned for each item that fails.
Either ItemID or VariationKey is required (but do not pass in both).
See the Field Index to learn which calls use ItemID.
A variation (or set of variations) that you want to watch. Use this to watch a particular variation (not the entire item). Either the top-level ItemID or VariationKey is required (but do not pass in both).
See the Field Index to learn which calls use VariationKey.
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