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Through the app, Canit users can either sell or buy empty cans and bottles they own. The buyer sees the nearest sales announcements on the map and can make purchase requests for them. From the purchase requests received, the seller selects the buyer to whom he will start selling his bottles. The selected buyer, in turn, retrieves the empty cans and bottles from the seller. The buyer will then return the bottles to the store and receive a cash equivalent of money.