Gift vouchers - Githubissues

Added support for gift vouchers.

vouchers has a type now - VoucherType: DISCOUNT_VOUCHER or GIFT_VOUCHER
gift vouchers are like prepaid cards, they have an amount defined in gift.amount
redeeming a gift voucher requires to provide amount value (VoucherRedemptionContext.order.amount)
you can redeem gift vouchers multiple times but the total amount cannot exceed the gift amount

voucherifyio / voucherify-java-sdk