Payment Gateway Integration in Flutter App+ Node.JS

I need a skilled developer to integrate PayPal and Stripe payment gateways into my Flutter mobile app with a Node.js backend. The integration should support one-time payments, recurring payments, and refunds. Additionally, the app should securely store payment details locally.

Requirements:
- Experience with Flutter and Node.js
- Familiarity with PayPal and Stripe APIs
- Secure storage of payment details
- Implementing one-time and recurring payment options
- Handling transaction refunds

Ideal Skills:
- Strong background in mobile app development
- Expertise in payment gateway integration
- Knowledge of security best practices for payment data

Please provide examples of similar work done.