Hello,
Welcome to Microsoft Q&A!
are we able to use our own payment API we are using on every other platforms: Web, PS4 and so on?
No, based on the Microsoft Store policy 10.8.1, it is mentioned that: All games and products offered on Xbox consoles are required to use the Microsoft Store in-product purchase APIs.
So you need to use Microsoft Store API in your app as it is required.
Thank you.
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