Cross-Platform QR Code Scanner App

I need a simple QR code scanner app that connects to the Robaws API.

Key Features:
- Platform: iOS and Android
- Use API key for authentication
- Scan standard QR codes
- Input quantity taken for multiple products

Ideal Skills:
- Mobile app development
- Experience with QR code scanning integration
- Familiarity with API key authentication
- Knowledge of Robaws API is a plus