The tools that I use include HTML5, /CSS3/, jQuery, /JavaScript, /Ajax, /PHP, & OOP, /MySQLi, & PDO Extension language.
The CMS & and framework platforms that I have developed for include Wordpress, Yii & and Zend.
I am also highly proficient at Adobe Suite CC (Dreamweaver, Photoshop, Illustrator & Indesign).
What kind of api is it?
a cart-checkout for the API? You mean check-out plugin? Paypal has a api, the only thing you need is to copy and paste the #'s on to the the checkout page file in the code.