Not only can consumers use all the major credit cards while checking out on a Shopify site, but merchants can also use Shopify’s POS system to accept credit card payments in the store or at pretty much any location. The Shopify POS allows merchants to accept credit cards in-store or on the go with very low transaction fees. With the Shopify card reader, businesses can enjoy low rates — down to 2.4 % — on all credit card transactions. The POS system syncs payment details with orders, giving merchants visibility into incoming revenue. Shopify also generates chargeback responses so businesses can recover lost sales. For code-savvy merchants or those employing development teams, Shopify is written in the open-source, Ruby-based template language Liquid. Shopify’s blog often presents Liquid best practices so merchants can make customizations to templates and fix issues after sites go live. Programmers can use Liquid to add functionality to templates without starting over with a new theme. The language is easy for seasoned developers to pick up, and Shopify facilitates learning the basics through its valuable help center.