In the world of web development there are always a thousand ways to solve a problem. Sometimes combing through the mountain of options is as much work as actually implementing the solution. The field for e-commerce is a competitive one with literally hundreds of competing platforms and systems. Some of these systems are convoluted, some generic, some expensive, some free and all are different in many ways.
Pixogee has developed e-commerce solutions around numerous platforms and while we can work with your existing systems, for new projects we heartily recommend OpenCart. OpenCart is a powerful, solid, versatile, and affordable solution with built-in support for numerous payment gateways and shipping providers. It can also power multilingual stores and shops with multiple currencies.