Shopify Marketplace App for our payment gateway

Freelancers, we have a problem. We have a payment gateway that we want to offer also to our Shopify clients and that is why we are in need of a Shopify app for their marketplace. We need someone who is very good with Shopify and knows how to develop apps in a way that can be put within the Shopify store.

Are you that problem solver for us.... let us know

P.S.: We solved the problem for WooCommerce and our API documentation for communication with the gateway is state of the art and shouldn't give you any problems using it..... or so they have told us :)