messenger.py

import json
import requests

def messaging_events(payload):
    """Generate tuples of (sender_id, message_text) from the
    provided payload.
    """
    data = json.loads(payload)
    messaging_events = data["entry"][0]["messaging"]
    for event in messaging_events:
        if "message" in event and "text" in event["message"]:
            yield event["sender"]["id"], event["message"]["text"]

def send_message(token, recipient, text):
    """Send the message text to recipient with id recipient.
    """
    r = requests.post("https://graph.facebook.com/v2.6/me/messages",
        params={"access_token": token},
        data=json.dumps({
            "recipient": {"id": recipient},
            "message": {"text": text}
        }),
        headers={'Content-type': 'application/json'})
    if r.status_code != requests.codes.ok:
        print r.text