Retreeb is based on 2 apps. The consumer app is the mean of payment on the Retreeb nerwork and the Retailer app is the soft POS for the merchand. Fees are support by the merchand and only by them from 0.9% to 1.5%. It's totally free for the consumer but he can selected the project he wants to support. Retreeb redistribute 33% of their own fees (paid by the merchand) to the project selected.