상황
Design a class model for an OTT platform where users redeem voucher codes to activate subscription plans and process payments.
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01
Abstract Voucher base class with SubscriptionVoucher and PromoVoucher subclasses
02
RedemptionService as orchestrator validating vouchers and charging payment gateway
03
Multiplicity captures one user initiating many redemption transactions
Use when modeling voucher-based access control, subscription activation, or payment orchestration in streaming apps.