[LEAK] Fades Promocode System

I didn't use the promo code system in Fades. Is this some kind of service that allows you to enter promo codes for products from any online stores, or does it allow me to present my QR code in stores in my city? I want to try something like this because I like to save on goods. I use various tools to track discounts on online stores, one of which is https://www.dontpayfull.com/explore. I'm the first to find out about such discounts among my friends, and they consider me a financially mature person who doesn't buy things thoughtlessly.