Schedule an AWS lambda with python 3.8 to run each day and logs in to stackoverflow. Put your email ("EMAIL") and password ("PASS") in the environment variables. lf you visit https://stackoverflow.com/ for 30 consecutive days, you can earn Enthusiast badge. And 100 days, Fanatic badge.

login-to-stackoverflow.py

import os
import re
import datetime
import json
import urllib3
from urllib.parse import urlencode


def lambda_handler(event, context):
    stack_overflow = StackOverflow()
    stack_overflow.login()
    return {
        'statusCode': 200,
        'body': json.dumps('yeeey!')
    }


http = urllib3.PoolManager()


class StackOverflow:
    base_url = 'https://stackoverflow.com/users/login'
    fkey = ''

    headers = {
        'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8',
        "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36",
    }

    params = {
        "ssrc": "head",
        "returnurl": "https://stackoverflow.com/",
    }

    def login(self):
        print('Start login ...')
        account = Account()
        print('Email : {}\nPassword : {}'.format(account.email, "*********"))
        payload = self.get_payload(account)
        encoded_data = urlencode(self.params)
        url = self.base_url + f"?{encoded_data}"
        response = http.request('POST', url, fields=payload, headers=self.headers)
        if response.status == 200:
            print("Logged in:{} with fkey: {}".format(datetime.datetime.now().strftime("%Y-%m-%d %H:%M"),
                                                                     payload['fkey']))
        else:
            print("Please check your email and password.")

    def get_fkey(self):
        print('Retrieving fkey information...')
        response = http.request('GET', self.base_url, fields=self.params, headers=self.headers)
        print(response.data)
        return re.search(r'"fkey":"([^"]+)"', str(response.data)).group(1)

    def get_payload(self, account):
        self.fkey = self.get_fkey()
        return {
            'openid_identifier': '',
            'password': account.password,
            'fkey': self.fkey,
            'email': account.email,
            'oauth_server': '',
            'oauth_version': '',
            'openid_username': '',
            'ssrc': 'head',
        }

    def get_profile_url(self, session):
        response = session.get("https://stackoverflow.com/")
        html = response.text
        return "https://stackoverflow.com" + re.search(r'<a href="(.+)" class="my-profile', html).group(1)


class Account:
    email = ''
    password = ''

    def __init__(self):
        self.email = os.environ['EMAIL']
        self.password = os.environ['PASS']