Dear Sir,
According to your request, I am able to help you to implement all the features mentioned by you including payment / API integration. Can I ask you what do you wish to sell?
As for me, I am professional Web Developer, having 10- year experience in Web- and E-commerce development. Besides I am a leader of Web Developers team, which consists of highly professional front- and backend Developers, Web Designers.
We specialize on LAMP (Linux, Apache, MySQL, PHP), Magento Commerce, osCommerce, Drupal, Wordpress, Joomla etc. Experts in HTML5, CSS3, Javascript (JQuery, Prototype).
We have finished more than 100 e-commerce and web projects. Look at our featured portfolio. We have worked on such clients as IBM Canada, Warner Brosers, Lipton.
You can contact me anytime to discuss any project with me.
Thanks and regards, Alex.