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Does the purchase token remain the same when a subscription is renewed with Android IAB V3?
Would it be a bad idea to rely on the purchase token as the user's ID on a backend server? (Assume throwing away their data when the subscription expired isn't a big deal)
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Open the Google Play app. Choose Account -> Subscriptions & Payments -> Subscriptions. Click your test subscription and change the payment method to “Test card, always declines.” After five minutes, payment should be declined.
According to this answer this answer, it remains the same.
So should be fine to rely on it, keeping in mind that it will be different if the user cancels and then purchases the subscription again.
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