Background browser script, program

Good afternoon, I need a program that will intercept 2 consecutive requests during regular surfing to write the information from two payloads into one line in a text file, and this file should be automatically sent in the background to a remote computer in a specific folder.
The format of the line in the file is "info1" - "info2". The information in the body of request2 needs to be modified with a couple of calculations.
The text file should be transmitted with some security for authorization or something else. (An open port without a login and password is not suitable)
Record a couple of values from two payloads only if payload2 was initiated.
Payload1 - name; payload2 - id. If a line with a specific name already exists, then the new parsed pairs of values should be written instead of the old ones.
A solution without any strange windows that suddenly need to be interacted with on a constant basis and other workarounds.
Only a beautiful and clear solution.
P.S. The requests come from the page code;

script, chrome, parsing, data parsing,

📄 Technical Assignment

Project:
Development of a solution for intercepting HTTP requests (XHR / fetch) in the browser and writing data from the request body (payload) to a text file with subsequent sending of this file to another computer.

1. Goal

When working on a specific website, it is necessary to intercept data from payload of two specific requests in real time:

1. URL-1 — get data from the payload, save it as the first part of the line.

2. URL-2 — get data from the payload, perform a simple arithmetic operation, add it to the first part of the line from URL-1.

As a result, both parts are written into one line of the text file 1.txt on the desktop.

2. Logic of Operation

• Intercept only 2 specified URLs (POST, XHR).

  • URL-1 arrives → remember the data (first part).

  • URL-2 arrives → supplement with data for the second part → write to the file.

• The links have values that can be understood as the links we need.

• There are no unique IDs for linking — the order of arrival is used (the last URL-1 is linked to the first URL-2).

• After writing the line, the buffer is cleared and we wait for the next pair.

3. Writing to File

• File: C:\Users\Administrator\Desktop\1.txt.

• Append line by line (new pair — new line).

• Line format: part_from_URL1<TAB>part_from_URL2 (or with another delimiter by agreement).

• Writing should be automatic and "silent" — without unnecessary windows and confirmations.

• The solution should work for a long time without restarting (the browser window is usually rarely closed).

4. Sending the File to Another Computer

• After updating 1.txt, it should be automatically sent to the remote computer. But if the file has not been updated again within 1 minute.

5. Requirements

• Work in Google Chrome on Windows.

• Intercept data specifically from payload (request body), not from the response.

6. Output

• A ready working solution (source code + installation/startup instructions).

• Instructions on how to change:

  • URLs;

  • file name;

  • arithmetic operation;

  • method of sending the file to another computer.