id
A string that identifies an offer that applies to the transaction.
Declaration
let id: String?Discussion
The id is the offer identifier that you provide when you set up an offer in App Store Connect.
This value is nil if the offer is an introductory offer for an auto-renewable subscription.
If the offer type is code, the id value contains the reference name of the offer code you set up in App Store Connect. For more information, see Set up offer codes.