notify.py

client_id = hidden_client_id()
import requests


auth = requests.post("https://id.twitch.tv/oauth2/token", headers={'Client-ID':client_id},data={"client_secret":"xxx","grant_type":"client_credentials"})

r = requests.post("https://api.twitch.tv/helix/webhooks/hub", headers={'Client-ID': client_id}, data={"hub.callback": "http://xxx.ngrok.io/","hub.mode":"subscribe",'hub.topic':"https://api.twitch.tv/helix/streams?user_id=xxx","hub.lease_seconds":600})

webhookcheck = requests.get("https://api.twitch.tv/helix/webhooks/subscriptions?", headers={"Authorization": "Bearer xxx"}, data={"first":"10"})

print(auth.content)
print("---------")

print(r.content)
print("---------")

print(webhook.content)
print("---------")

server.py

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['GET','POST'])
def result():
    #print(request.data) # should display 'bar'
    #print(request.json) # should display 'bar'

    return 'Received !' # response to your request.