I recently had a chance to work with the Shopify Java-script API to refresh Dead Celebz website. The goal, put up an e-commerce site as quickly as possible and as cheaply as possible. The Shopify API is incredibly powerful for quickly putting up a cart and check out experience. I was impressed at how easy it came together. Although the lite version of the plan is missing some major features especially in shipping calculation, it's a great way to get up and moving with a minimum viable product.