[Frontend] Implement QR Code Scanner with SEP-0007 Support

[ONEONUORA]

🎯 Objective

Build a robust QR code scanner that supports SEP-0007 payment URIs for scan-to-pay functionality.

📋 Requirements

• Camera-based QR code scanning
• SEP-0007 URI parsing and validation
• Display payment details before confirmation
• Support for static and dynamic QR codes
• Handle deep links from QR codes
• Add manual address entry fallback
• Implement QR code generation for receiving payments

🔧 Technical Details

• Use expo-camera or react-native-camera
• Implement SEP-0007 URI parser
• Validate Stellar addresses and amounts
• Add camera permission handling
• Support both G-addresses and federated addresses
• Implement QR code generation with react-native-qrcode-svg

✅ Acceptance Criteria

• Scan QR codes from camera
• Parse SEP-0007 payment URIs correctly
• Display payment details (recipient, amount, memo)
• User can confirm or cancel payment
• Handle invalid QR codes gracefully
• Generate QR codes for receiving payments
• Works in low-light conditions
• Camera permission properly requested

Priority: High
Component: Frontend/Payments

[Menjay7]

@Menjay7 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi! I'm, a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Menjay7 to this issue.

[Favourof]

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

I will love to take on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Favourof to this issue.

[Bhenzdizma]

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

My name is Lawrance. I am a frontend developer and smart contract developer, and I would love to contribute to your project.
I’m particularly interested in taking up this issue and I’m confident I can deliver it within 24 hours. I enjoy working on meaningful open-source projects and contributing clean, reliable solutions.
I’d be glad to be considered for this task, and I’m ready to get started immediately.
Thank you for the opportunity.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Bhenzdizma to this issue.

[drips-wave]

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

🧑‍💻 @Bhenzdizma: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @Bhenzdizma as part of the Stellar Wave Program's 4th Wave 🥳

😎 @Bhenzdizma: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.