Using EasyXDM in Shopify to access the cart

client.js

window.Shopify = new EasyXDM.Rpc({
  remote: "http://domain.myshopify.com/cart"
}, {
  remote: {
    getCart: {}
  }
});

server.js

new easyXDM.Rpc({}, {
  local: {
    getCart: function(callback) {
      return $.getJSON("/cart.js", function(cart) {
        return callback(cart);
      });
    }
  }
});

usage.js

Shopify.getCart(function(cart){
  console.log(cart);
});