Payment Integration Specialist Needed

I'm looking for a developer with expertise in e-commerce platforms that incorporate their own payment gateways, like Shopify and Wix. I want to register my business on platforms that provide payment methods directly, such as Union Pay, Apple Pay, American Express, Discovery, and Google Pay.

Key Requirements:
- Deep understanding of various e-commerce platforms and their payment integration capabilities.
- Experience with platforms that offer payment methods.
- Ability to integrate and register multiple payment methods on a single platform.
- Knowledge of global payment methods and their platforms.

Please note, I prefer not to directly register with payment gateways. Instead, I want to go through platforms that have their own payment methods. The primary payment methods crucial for my business are Apple Pay, Google Pay, American Express, Union Pay, and Discovery.

Looking forward to your proposals.