In this chapter, we explored most of the system level libraries that OpenCart provides. We explored most of the extra code used in the
Featured Product module by which you are now able to know the code flow of the OpenCart module. Likewise, we created a new
Shipping module, which shows the shipping cost according to the total cost purchased by cloning the weight-based shipping. Similarly, we discussed the payment module of OpenCart and the ways to clone it. With this, you are able to start coding with OpenCart Extensions (Modules, Payments, and Shipping).