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need a developer to integrate cryptocurrency payments into my existing booking system and create a basic blockchain-based loyalty program. 1. Crypto Payments (Using a Payment Gateway) • Integrate Coinbase Commerce, BitPay, or CoinGate • Enable QR code payments for customers • Set up instant crypto-to-fiat conversion (AUD) • Create a simple confirmation flow for completed payments • No custom chain needed for payments — gateway only 2. Loyalty / Rewards System (Polygon or Base) • Build a simple smart contract for customer reward points or badges • Store rewards on-chain (Polygon or Base) • Provide API endpoints to issue and read loyalty points • Create a basic script or panel to manage rewards • Keep the solution lightweight and easy to maintain Requirements • Experience with crypto payment gateways • Solidity + smart contract experience • Knowledge of Polygon or Base • Good understanding of security best practices Deliverables • Fully working crypto payment option • QR code flow • Smart contract for loyalty system • API integration • Basic documentation Open to fixed-price proposals. Send previous work and your recommended approach.