🔧 Add biometric authentication

[Smartdevs17]

Problem

No authentication required to view sensitive data.

Context

Users may share devices, exposing wallet addresses and subscription data.

Proposed Solution

Add biometric auth:

1. Prompt on app launch
2. Use Face ID / Touch ID / fingerprint
3. Fallback to PIN
4. Optional in settings

Acceptance Criteria

• Biometric prompt on launch
• Fallback works
• Can be disabled
• Protects sensitive data

Technical Notes

Library: expo-local-authentication
File: App.tsx or navigation

Constraints

• Handle missing hardware
• Privacy considerations
• Performance impact

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 150 Points.

🧑‍💻 Interested in contributing? Apply to work on this issue on Drips Wave, earn points, and receive rewards.

Warning

Only applications submitted via the apply link above will be considered. Please do not apply by commenting on the issue or opening a PR directly.

🤠 Repo maintainers: You can manage this issue's Points and Complexity on your Maintainer Dashboard here. Please keep an eye on applications and respond quickly 💙

ℹ️ Learn more about Drips Wave

[eleven-smg]

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

I would like to work on this issue
I can start working now

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

[Danitello123]

@Danitello123 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I’m a smart contract and full-stack developer who turns complex ideas into secure, production-ready blockchain code.
With strong skills in Rust and Solidity, I build systems that are fast, safe, and built to last.
My experience with the Stellar SDK lets me ship real-world Web3 solutions that actually move value

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Danitello123 to this issue.

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I'd love to work on this

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

[drips-wave]

Congratulations, @rindicomfort! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @rindicomfort: 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 🌊