Feature description:
Consider publishing the app on alternative platforms to Google Play. For example, Huawei AppGallery.
Problem solved:
This will allow users to choose a platform to purchase the app. Google Play has obvious drawbacks, for instance, it does not work in a number of countries. Additionally, you have a whole separate thread dedicated to issues related to Google Play.
Brought benefits:
Users will be able to purchase the app more easily, and you won’t have to manually process payments, as you are doing now.
Other application solutions:
Additional description and context:
Screenshots / Mockup: