Core: Implement Payment Request QR Code with NFC Integration

[Smartdevs17]

Description\nImplement QR code payment requests with NFC tag support for in-person payments. Enable tap-to-pay using NFC-enabled devices.\n\nCurrent Limitation: No QR/NFC payment support.\nExpected Outcome: QR code generation and NFC tag writing for in-person payment requests.\n## Acceptance Criteria\n- [ ] QR code generation with payment URL\n- [ ] QR code style customization\n- [ ] NFC tag writing for payment request\n- [ ] QR code scanning via camera\n- [ ] NFC foreground dispatch\n- [ ] Offline payment handling\n- [ ] Amount input before scan\n- [ ] Transaction confirmation\n## Technical Scope\n- Files: frontend/payments/qr, backend/nfc\n- Edge Cases: Invalid QR codes, offline devices\n## Complexity Estimate\n200 points - QR generation, NFC APIs, UX.

[distributed-nerd]

@distributed-nerd has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

can i work on this

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[drips-wave]

Congratulations, @distributed-nerd! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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