Proxy Providers with JWT Authentication: How to bypass login and fetch a token?

[moutasem1989]

The Basic HTTP Authentication comes really handy to bypass a second login for Proxy Providers that use it but cannot disable it: like Kasm Standalone Desktop and Cockpit. But most services use JWT Authentication with no support for OIDC or SSO; like NGINX Proxy Manager.
I assume that requesting a fresh token can be something like this in python:

import requests
import json

# Define the URL and the headers
url = 'http://localhost:81/api/tokens'
headers = {
    'Content-Type': 'application/json; charset=UTF-8'
}

# Define the payload with your email and secret
payload = {
    'identity': '[Your Email]',
    'secret': '[Your Secret]'
}

response = requests.post(url, headers=headers, data=json.dumps(payload))

return response.passing

Sadly the only documentation I found is rather unclear. Any help is greatly appreciated!