Contracts: Subscription program (Solana / Anchor)

[PetarStoev02]

Parent

Part of #13 (Phase 4: Smart Contracts + Templates)

Goal

Create an Anchor subscription/billing program for recurring SPL token payments.

Requirements

• Subscribe with SPL token payments
• Configurable billing period and amount
• Renewal and cancellation
• Merchant withdrawal
• Anchor test suite
• .learn.md with explanations and security considerations

Location

contracts/solana/subscription/

[github-actions]

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