Digital service in Quest & Go mobile app
To develop an aggregator or develop a mobile service, first that you need to think about the market. What we did:

After which it was decided to create a mobile service application aggregator that includes the following functions:
the ability to register and authorize two types of users;
Personal accounts of users;
The ability to display events and organizations on a city map;
Booking and reservation of time;
Online payment including through Apple Pay;
The recall function after attending an event.
What in the end we did to create a technological service:
Conducted market analysis:
Modeled the economy and types of competitive environments;
Developed terms of reference and UX / UI application design;
Designed a database in MySQL and implemented a PHP server;
Made an administrative panel on React;
Developed a mobile application in the native language SWIFT;
Placed in the App Store.