Android App Development for Secure Redeem-Code Workflow

We are seeking an experienced Android developer to create a robust and secure mobile application for managing a redeem-code workflow. The primary function of the app will be to allow users to enter a unique redeem code once and then submit it to multiple authorized accounts with a single tap. The application must be designed with a simple, intuitive, and Android-friendly user interface.

Key features and requirements include:
- Single entry point for redeem codes.
- Display of all authorized user accounts linked to the app.
- One-tap submission of the entered redeem code to all authorized accounts.
- Clear display of success or failure status for each individual account after submission.
- Robust mechanism to prevent duplicate code submissions to the same account.
- Comprehensive and user-friendly error messages for any issues encountered.
- Implementation of an activity log to track all code submissions and their outcomes.

Critical Security and Compliance Requirements:
- The app must strictly utilize the platform’s official API or an officially permitted integration method. No unauthorized methods are to be used.
- The application must not bypass or attempt to circumvent any security mechanisms, including but not limited to captcha, otp (one-time password), rate limits, authentication protocols, or anti-bot systems.
- The selected developer must confirm that their proposed implementation fully complies with all platform rules and terms of service.

Freelancers should provide details on their proposed development time, total project price, technology stack and architecture, and any previous relevant API or automation experience. The final deliverable must include complete source code and detailed setup instructions.