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I have just implemented InAppPurchase functionality for an Android app where users can subscribe to a product. And it is working fine along with the validation process. But if the user goes for downgrade or up-gradation then my Google play generating a new Token for that and attached the old token (linkedPurchaseToken). Right!

linkedPurchaseToken = "null" ------ again

So, how can I invalidate that token? Like a newly purchased item has linkedPurchaseToken = "null" if I verify using Cloud Function and for product migration, it has a token. Please help. I'm stuck over here.

Subhojit Halder
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    I have a similar problem. If I resubscribe after the subscription expired the linkedpurchasetoken is also null meaning I can't associate the purchase. Did you manage to solve that issue yet? – user3279779 Jun 25 '20 at 15:21

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