Both groupId and feedId parameters are required to be non-empty otherwise this event will not be tracked.
The groupId represents a group of similar items. For example, a shirt will have the same groupId for all variations of that shirt (different sizes/colors, etc). I.e. each size/color combo will have a different feedId but the same groupId.

Implementation

Wunderkind.getInstance().trackSelectSku(String groupId, String feedId, String itemId)

Wunderkind.shared.trackSelectSKU(groupId: String, feedId: String, itemId: String)

Wunderkind().trackSelectSku(groupId: string, feedId: string, itemId: string)

Wunderkind.trackSelectSku(groupId: string, feedId: string, itemId: string)