This client can be utilized as an adapter for using the Shopify API with the ZendFramework version 2. The client requires PHP 5.3 for use. This is a community maintained library authored by Matthew Peterson and open sourced on GitHub. The client is endorsed for use on the Shopify API developer documentation's list of 3rd party libraries.
So far, Paul Hunkin's bot has bought him two sets of camera batteries, a gift bag, a USB extension cord, a 1955 stamped envelope and a smattering of other items. Hunkin, you see, decided to bring an XKCD cartoon to life by programming a bot that automatically purchases cheap items using a New Zealand auction site's Trade Me API... because packages are exciting.
Based in Vancouver, BC, Payfirma has created an XML-based API that promises custom forms and full shopping carts to keep you in control of developing the flow of your credit card processing. The idea is to make business's lives simpler by reducing development costs with the Payfirma API that accepts Visa, Mastercard, Discover, and American Express among others.