How to pull information from a mobile game?

Question

Parsing

There is a site https://statsroyale.com/ru/ how do they collect information from the Clash Royale mobile application? Is this possible without the help of developers? I once heard the opinion that from mobile applications you can safely receive any information that comes to the client, but since I am not competent in this matter, I hope I will find out the truth here.
The task is extremely simple, you have your own clan and you simply want to keep track of how many people have already spent in the clan, collect their number of victories and defeats in clan wars (all this can be seen in the game client), but I don’t understand how to pull it out of the game client, only the parser remains site.

Answer 1

All the same, I found how they get information from this game, officially everything is open https://developer.clashroyale.com

Answer 2

If the company's income is open, then you can watch them.
Otherwise, you can either buy this data or take it from an insider (which is also not free).
In general, all the most delicious statistics are paid. Choose from: App Annie, Superdata, Newzoo, Datamagic, SensorTower, AppData, etc.