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Are Apple in-app-purchase transaction_ids unique only for a given app or product, or are they in fact globally unique?
Example: If a transaction_id (eg 1000000019169002) exists for an application A, is it possible for that transaction_id to again be returned for a different transaction against a second application B?
In the purchase info you will get both prodcut_id and transaction_id, so if you verify both together it will be guaranteed unique. It´s not possible to find any information about the transaction_id uniqeness alone.
You can also see the In-App Purchase Programming Guide for more information.