How to find out the structure of the site's API?

Question

API

Good afternoon, there is a site that sells products. When changing the parameters of the width, height or color, the prices for variations change accordingly. He accesses the api, he gives json which changes the prices. The problem is that I have a lot of variations. I would like to know the API structure itself so as not to take it in pieces, but to pull out all the prices for all variations with one request. Since you can find out the structure of the API itself. requests are sent to this url :
hostname /Merchandising/

Answer 1

There are programs like HTTP Analyzer, such a program can be used to view requests.
You perform certain operations on the site, let's say a filter by price, catch the request with the analyzer,
see what request went to the api, and you are already trying, through logical reasoning and selection, to make the right request to the api.