cashback Amount
Cashback included in the total amount, in the same currency and no greater than the total.
fun cashbackAmount(value: Long, fractionDigits: Int, currency: String): TransactionRequest.PurchaseWithCashbackBuilder
Cashback amount, expressed with fractionDigits fraction digits instead of currency's own default - see amount for why this overload exists.
fun cashbackAmount(value: Long, fractionDigits: Int, currency: Int): TransactionRequest.PurchaseWithCashbackBuilder
cashbackAmount taking the ISO-4217 numeric currency code instead of the alphabetic one.