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Subscription Restoration and Purchase Error

Dear Qonversion Support Team,

Subscription Restoration Across Multiple Devices:
My app currently does not have a login implementation to serve as a unique identifier for users. I am facing difficulty in implementing subscription restoration across multiple devices in such a scenario. Could you please guide me on how to achieve this without relying on user logins? Any insights or best practices would be greatly appreciated.

Purchase Callback Error:
When making a purchase with the Qonversion SDK, I am receiving the following error callback: QonversionError: {code=PlayStoreError, description=There was an issue with the Play Store service, additionalMessage=HTTP status code=422, data={"message":"The document type is not supported.","code":20399,"status":422}. }

It's important to note that I made the purchase using a Google Play tester account in the Qonversion production environment (QLaunchMode.SubscriptionManagement). I would appreciate any guidance on resolving this error and understanding the underlying issue causing the Play Store service error.
Your prompt attention and support in resolving these matters will be highly valuable.
Thank you in advance for your assistance. I look forward to hearing back from you soon.