Intercept & Decrypt Naver Login

I want to capture the exact network call that fires after I press the “로그인” button on my own Naver account, pull the JSON payload that carries my user credentials, and then decrypt those credential fields so I can read them in clear text.

Here’s what I already know
• Target: https://www.naver.com/ standard web-login flow (desktop browser)
• Payload format: JSON
• Data needed: the portion containing my user credentials (ID, password, any salt or nonce)

What I still need
1. A repeatable way—script, proxy setup, or browser automation—to intercept that single POST/GET request every time I log in. Burp Suite, Fiddler, mitmproxy, or a custom Puppeteer/Playwright script are all fine as long as they work reliably.
2. A clear extraction of the raw JSON payload from that request.
3. A working decryption routine for the credential values. The site may be using an in-page JavaScript cipher; the exact algorithm is not yet confirmed, so part of the job is to identify it and implement the corresponding decrypt function (Node.js or Python preferred, but I’m open).
4. A concise walkthrough so I can rerun the whole process on my side without extra tools.

Acceptance criteria
• Running the provided steps on my machine reproduces the captured request.
• The output shows my username and password in plain text after decryption.
• All code is commented, and any third-party libraries are noted with version numbers.

If you’ve handled similar AJAX or encrypted form logins before and can turn this around quickly, let’s get started.