Apple won't say much as long as you're not giving people something in exchange for sats, like unlocking content or, like in our case, the possibility to convert from sats to an in-app currency (CC).

To circumvent something like that, you would need to remove references to it in the native app and redirect users to an external website.

Tipping or, zapping, is not a digital good so if it's only that, it should be cool!