Replacement takes effect when the old plan expires, and the new price will be charged at the same time.
Replacement takes effect immediately, and the user is charged full price of new plan and is given a full billing cycle of subscription, plus remaining prorated time from the old plan.
Replacement takes effect immediately, and the billing cycle remains the same.
Replacement takes effect immediately, and the new price will be charged on next recurrence time.
Replacement takes effect immediately, and the remaining time will be prorated and credited to the user.
Replace SKU ProrationMode.
See https://developer.android.com/reference/com/android/billingclient/api/BillingFlowParams.ProrationMode