https://developer.android.com/reference/com/android/billingclient/api/BillingFlowParams.ProrationMode
BillingFlowParams.ProrationMode | Android Developers
androiddevelopers
https://developers.meta.com/horizon/reference/horizon-billing-compatibility/v1.1.0/root/com.meta.horizon.billingclient.api/billing-flow-params/proration-mode/
ProrationMode | Meta Horizon OS Developers
meta horizonosdevelopers