Credit against the consumption amount of 79 yuan. According to Sohu News, Haidilao is a well-known Chinese hot pot restaurant chain. The "79 coupon" refers to a coupon issued by Haidilao, with a face value of 79 yuan. Voucher is a specific denomination of the coupon, the holder can use the coupon in the consumption of the corresponding amount of credit, the use of Haidilao's 79 vouchers, in the checkout can be deducted from the amount of consumption of 79 yuan, to play a role in reducing costs.