2. Every koi fish card user can enjoy the one-time benefits of saving money to buy goods in 0 yuan. After purchasing the products in the special area and confirming the receipt (without after-sale, the same below), the products will be returned in full cash after 15 days, and delivered to 0 yuan by post. Every day, there are 10, 12, 16, 20 and 22 o'clock, and so on. After receiving the goods 15 days, koi fish card users will return a red envelope that is 1 yuan less than the payment amount, that is, 1 yuan to buy the corresponding goods.