Flutter PhonePe Integration

I need a Flutter developer to integrate the PhonePe payment gateway into my existing app. The app is currently on the stable version of Flutter.

Requirements:
- The integration should specifically handle subscription payments.

Ideal Skills and Experience:
- Proficiency in Flutter development.
- Experience with PhonePe payment gateway integration.
- Familiarity with handling subscription-based payment processes in mobile apps.

Please provide relevant work samples and estimated timelines.