Custom WooCommerce Payment Gateway Development

I'm seeking an experienced WooCommerce developer to create a custom payment gateway plugin, mirroring the functionality and structure of the official WooCommerce Stripe Gateway.

Key Requirements:
- Integration with MTN Payment API via REST
- Core Functionalities:
- Automated terminal activation
- Invoice creation
- Payment processing via phone number & SMS verification
- Refunds management
- Security:
- Digital signature (X-Signature)
- Secure handling of keys and customer data
- Easy configuration through WooCommerce backend

Ideal Skills & Experience:
- Proficiency in WooCommerce & WordPress plugin development
- Strong knowledge of PHP, REST API integration, and JSON
- Prior experience with payment gateway integration