E-commerce Payment Integration with One Pay

I am in need of a proficient web developer with experience in payment gateway integration, specifically with One Pay. The integration is for my E-commerce website and it should be seamless and secure.

Ideal Skills and Experience:
- Proven experience in E-commerce website development
- Expertise in integrating One Pay as a payment gateway
- Strong understanding of secure payment processing
- Prior work with other E-commerce payment gateways is a plus