Find requests for data from the site (parser)

Hello, there is not enough knowledge to implement the task, I have a fairly simple algorithm to work on a third-party site, it is necessary to optimize 2 parsing actions on a third-party site so that the script would work well. If you do it with your hands, then the actions are as follows: 1. There is a page with a list of users, in the dom only login of users, for correct operation you also need a user id - it can be found by switching to login.site.ru there will be a redirect to site.ru/login/id but perhaps this is not what we need and the id can be obtained without this from the original page. 2. Each user on his page site.ru/login/id has a number of statistics that also need to be collected. For each user to go to the redirect and load the full page is resource-intensive and not rational, I am looking for a person who can find a solution for all this on post get and so on Site 18 Everything is discussed