That’s good information. I jave never set that kind of thing up myself but I think most people would tell you that this aspect of the game doesnt live in the game engine, so it’s less of a question of how to store the information using Unreal and more a question of how to set up a web server and use it to store and retrieve player data. Once you have that working you can get Unreal to talk to the server to request and update the players’ information. The generation of the unique clan identifier should probably be done on the web server too rather than in Unreal. I would learn how to do the web server part first and THEN the unreal part because the unreal part doesnt have anything to work on otherwise but the webserver part can be developed and tested without the unreal part.
If you’re doing it in blueprints then there is a handy plugin called VaRest that makes HTTP requests to web servers and returns their response. You can use this to read and write data between your game and the web server, once your web server is programmed to handle those HTTP requests by doing the actions you want such as doing a SQL query or loading a file or however you decide to do it. Just be aware that the web server’s ability to do anything is not going to involve any Unreal skills, it will involve back end web programming or configuration skills, and can be done hundreds of ways and in any programming language (or even without a programming language depending on the type of server used)