How to catch requests to the server from an Android application?

Question

Android

There is an application of the famous Fast Food chain Burger King ( link )
It has a function to enter a code by which you can find a particular dish / promotion.
If the entered code does not exist, we get the appropriate response.
If the code is available in the database of dishes (each dish has a code), a window with this dish opens.

How can I find out the request that is sent to check the code, so that later I can send this request manually. I.e. It is necessary to somehow pull out the body and address of the request.
Screenshots:

Answer 1

1. If everything is human there and goes through https - well, practically nothing :)
2. If suddenly through http, then put charles proxy and set up work with a proxy on the device

Answer 2

https://burgerking.ru/images/actions/2019/burgerma...
Corrected the answer.
Legally, it is more correct to classify your actions as an attempt at fraud.
There is no composition of theft in forgery of codes, as I first wrote.