Warm Greetings!!!
Yes, I can surely assist you to integrate a SMS gateway, payment gateway into your existing website and mobile Apps. I am available with complete expertise in integrating payment gateways and APIs into websites so I can surely assist you and can start right now.
So can you please send me the complete detail so that I can analyze and will move further.
I have complete expertise in PHP/MySQL, html5/css3, javascript, jquery, Ajax, Photoshop, Payment and API integration, twitter-bootstrap, PSD slicing, converting them to HTML, illustrator, landing page designing with responsive design, etc.
I have developed many payment gateways I can show you. please message me so we can discuss further regarding the project.
Please Come on chat then we can discuss More.
Thanks and Regards.