Apple Pay - How we can check subscription updates

Hello, we recently added Apple Pay to our application, and we have some controls for subscriptions with transactionId. I have a question: If a user updates their subscription via the App Store, can we still use the same transactionId, or should we take another approach? Thank you.

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Why any apple employee don't help to me I really wonder you guys have worst documentation in the world why I have to fight with your apis every day? I never had a problem with google pay api's but I always have problem with apple stacks thank you :)