The configuration for this script is broken into two distinct files for security.
Client Side (cl_config.lua)
Client configuration is used to setup the location, label, and id of the shop/buyer. It also allows you to set the ped. For more detailed information see cl_config
Server Side (sv_config.lua)
The server configuration file is used to set the items a shop will buy, the price they will pay, and the exchange item they are willing to give you for the item they are purchasing. For more information see sv_config