isWrapper property
If this is true, the object is actually a "wrapper" of the object it's representing. This means that it's not the actual item itself, but rather an item that must be "opened" in game before you have and can use the item. Wrappers are an evolution of "bundles", which give an easy way to let you preview the contents of what you purchased while still letting you get a refund before you "open" it.
Implementation
@JsonKey(name:'isWrapper')
bool? isWrapper;