Dynamic Payment Platform Development

I already have a basic front-end scaffold in place, but it is still only a shell. I now need a developer who can turn this skeleton into a fully responsive, production-ready payment platform that talks smoothly to a server and a database... (Budget: $250 - $750 USD, Jobs: AngularJS, API Development, Backend Development, Database Development, JavaScript, MySQL, PHP, React Native, React.js Framework, Web Development)