FIELD: computer engineering; payments for goods and services with discounts.
SUBSTANCE: customer card identification information is entered; information is identified and information about every customer who expressed his agreement to the conditions of trade is entered into archive block of database. Customer chooses the required goods, identification information is entered into memory block of initial data array, goods cost is entered into control and data processing unit. Customer pays for the goods in cash or by credit card, the seller forms the discount value according to the frequency of purchases by this customer, total sum of purchases, range of purchased goods, time of purchase and the sum of discount is returned to the customer in any form acceptable for the customer.
EFFECT: increased effectiveness of trade and increased commodity turnover.
