Building a customer WooCommerce payment gateway

We need to build a custom Woocommerce gateway according to their documentation below:

https://docs.woocommerce.com/document/payment-gateway-api/

The actual payment processing will be done through SendWyre.com API and we want to upload the information into WooCommerce.

Must have significant WooCommerce experience, rich experience integrating various APIs and Firebase experience is a plus.

The checkout UI will be provided as a Figma file or we can purchase a theme. Whichever is easier.

Deliverables
-Integrate SendWyre.com API
-Integrate Firebase
-Implement UI for checkout fields form
-Register transaction as an order within WooCommerce