How do sweet deals from sites like DontPayFull work? On-site, we have a pack of treesje coupon codes, treesje promotional codes and treesje discount codes. For the treesje offers and additional products, you can receive equal coupon codes as well. When you visit the online shopping site where you are making a order from, all you have to do is key in the coupon code. It works pretty much the same practice that an actual magazine or newspaper coupon does. Once the code is used, you can find a certain ratio off the original price - which means great savings for your online shopping purchases!