The shop is a collection of items fully manageable by the client in GWADMIN.
The client will select the items name, image, price (based on the input of avg. coin earn from GWEN), availability rules, quantity rules, etc.
Coins can be earned as rewards in other modules based on variables set in the chosen Behavior Table & Module Package in GWADMIN.
When an item is purchased - GWEN will send an update of this to the client that is then responsible for handling the "payout" of the item bought.