Server Part of the Mir Loyalty Web Service of the Mir Payment System

There are growing number of loyalty cards from many sources year over year. Some stores and restaurants still use a large number of plastic cards in order to identify a preferential customer, while others launch their own mobile applications, which require you to enter and show an electronic card to receive discounts and bonuses, but this creates confusion and misunderstanding of consumers, where they have a loyalty card of such store or restaurant and where it is not. To solve this problem, a bank payment card will help, which can replace loyalty cards of various stores and restaurants, providing customers (buyers) with ease of use and providing a new service for paying for purchases with discounts in "one touch" (both for contactless payment cards or mobile devices, and for contact payment, when the buyer interacts with the payment terminal once). For this purpose, it is necessary to develop a web service for stores that will allow them to quickly and conveniently find out whether a customer with a given bank card has their loyalty card without the need for additional customer actions directly when purchasing goods and services. The document describes the design and development of such a service for stores and banks. The first Chapter will present a comparative analysis of existing solutions and the service being developed. The second Chapter is devoted to the design of the service. It describes the main functions of the service, the subject analysis of the area, as well as a comparative analysis of possible architectural solutions of the main parts of the service. The third Chapter describes the selected technologies and the development of the key components of the service. The work contains 64 pages, 3 chapters, 16 figures, 2 tables, 9 sources, 4 appendices. Keywords: loyalty program; web-service; API, payment systems