UE 5.2 brings Android Billing up to 5.0.
UE 5.3 brings Android Billing up to 6.0.
However, I have not been able to get Android in-app purchases working in UE 5.3 yet so I’m not sure what’s going on, it could be buggy. Works for me in 5.2 though (although iOS doesn’t in 5.2).