Doom Forge Facebook Game cheat

Doom Forge is a facebook game, in this game you can leveling your character (hero), buy equipment to power up your character power, fight another player character..
There are various cheat and hack to use in this game, let's we begin with "Change the shop value of any equipment" so you can buy that equipment for free...

What do you need to do that?
1. Charles Web debugging Proxy
2. Browser to