상황
Design a class model for an OTT platform's voucher redemption system, focusing on user account management, subscription plans, voucher validation, and redemption tracking.
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01
Modeled User and Account as separate classes to separate identity from authentication.
02
Used multiplicity on associations to capture one-to-many relationships.
03
Included VoucherStatus and SubscriptionStatus enumerations to constrain lifecycle states.
Use when modeling backend services for streaming platforms that support voucher-based subscription activation and account management.