Hi,
I already have experience to Implement mailchimp api to site, and also online payment getaway integration i.e. Paypal, Stripe, Bitcoin etc. I am assure that i can do this task as per your needs.
Relevant Skills and Experience
I am 8 years experienced Web developer/designer and working with following technologies -WordPress, E-Commerce, JavaScript, JQuery, Bootstrap, APIs,HTML5, CSS3,Shopify,Codeigniter, Cakephp, PHP etc.
Proposed Milestones
$75 USD - Initial
$75 USD - Final