Is transactionId unique?

I want to track subscriptions of multiple applications and need to choose unique key.

Can transactionId from app1 match somehow transactionId from app2?

If yes, then Is it possible situation: app1 and app2 have products with same productId (e.g. "com.subscription") and have transactions with same transactionId?

So should I use key (appAppleId, productId, transactionId)?

(It would be more convinient to use transactionId, but I am not sure about uniqueness)

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pperestoronin
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yes, it is unique that customer and that application. https://developer.apple.com/documentation/appstorereceipts/transaction_id

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App Store Commerce Engineer
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yes, it is unique that customer and that application. https://developer.apple.com/documentation/appstorereceipts/transaction_id

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App Store Commerce Engineer
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No it's not. If they restore they will make another transaction that has a different id for the same thing. try weborderlineitemid or the date they paid for it combined with the plan.

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christruelson
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