Set up proxies, then check them.

import os
from playwright.sync_api import sync_playwright

PROXY_USER = os.environ["PROXY_USER"]
PROXY_PASS = os.environ["PROXY_PASS"]

with sync_playwright() as p:
    browser = p.chromium.launch(proxy={"server": "http://proxy.example.com:8000", "username": PROXY_USER, "password": PROXY_PASS})
    page = browser.new_page()
    page.goto("https://api.ipify.org?format=json")
    print(page.inner_text("body"))
    browser.close()