http://matekasse.server.c3h/api/tag_id?={tag_id}
Response: {"mode":"error" "error":"{error}"} or {"mode":"message","username":"{username}","message":"{message}"} or {"mode":"balance", "username":"{username}", "balance":"{balance}"}
http://matekasse.server.c3h/api/change?id={user_id}&?change={change}
If change = None or NaN the change will be -1
Response: {"mode":"error" "error":"{error}"} or {"mode":"balance", "username":"{username}", "balance":"{balance}"}
170: Tag already exists
054: Tag does not exists
757: Usere already exists
043: User does not exists
352: Timeout
095: Input is not a Number
418: I'm a teapot