I can make one button compatible with existing cart system. I have done many similar projects and thus have very good experience and knowledge of this.
Relevant Skills and Experience
Experience: 5 Years
Skills: PHP, Cake PHP, HTML5, CSS, JavaScript, Wordpress, Bootstrap, MySQL, Graphic Design, HTML, Magento, Website Design, Drupal, Code Igniter.
Proposed Milestones
₹1450 INR - Button work
Stay tuned, I'm still working on this proposal.