Webhook server for Facebook messanger

import json
from flask import Flask, request
from pymessenger.bot import Bot

app = Flask(__name__)
ACCESS_TOKEN = 'ACCESS_TOKEN'
VERIFY_TOKEN = 'VERIFY_TOKEN'
bot = Bot(ACCESS_TOKEN)

def verify_fb_token(token_sent):
  #take token sent by facebook and verify it matches the verify token you sent
    #if they match, allow the request, else return an error 
    if token_sent == VERIFY_TOKEN:
        return request.args.get("hub.challenge")
    return 'Invalid verification token'


#chooses a random message to send to the user
def get_message():
    sample_responses = ["You are stunning!", "We're proud of you.", "Keep on being you!", "We're greatful to know you :)"]
    # return selected item to the user
    return random.choice(sample_responses)

#uses PyMessenger to send response to user
def send_message(recipient_id