I need backend developer to integrate payment gateway on the backend and create it's page on admin panel, so he can provide endpoint to the Android user to implement on the frontend -- 2

I am looking for a backend developer to integrate a payment gateway on my custom-built admin panel and create a page for it. Its developed with php ci ,The ideal candidate should have experience in PHP and be able to provide an endpoint for Android dev. to implement on the frontend. I am looking to integrate a payment gateway which is https://monnify.com/ into my Android app with backend