@@Enviroment Setup process@@

First we need to create a virtual enviroment for installing requirment.txt In python we use following commands for cretaing virtual enviroment $virtualenv <env_name>

activate the env with following command $ source <env_name>/bin/activate

Then we need to install all packages on requirment.txt file

$pip install -r requirement.txt

or install one by one

$pip install Flask

$pip install facebookads

so on

@@ Key changes in method @@

I have added my sample account keys of facebook and mail-gun for run the script, Because I don't have permisiions to add webhook to your facebook page.

You need to change those keys with your account keys

flaskapp/hello.py

def hello_world(formId):
    # Facebook app keys
    my_app_id = <YOUR_FB_APP_ID>
    my_app_secret = <YOUR_FB_APP_SECRET>
    my_access_token = <YOUR_FB_APP_ACCESS_TOKEN>

flaskapp/hello.py def add_list_member(email,name): #Mail-gun api keys key = <YOUR_MAILGUN_API_KEY> domain = <YOUR_MAILGUN_DOMAIN> if it is sandbox domain, It will not sent mail to another mail ids, It's sends only authorized mail ids only.

def hello_world(formId):
    # Facebook app keys
my_app_id = <YOUR_FB_APP_ID>
my_app_secret = <YOUR_FB_APP_SECRET>
my_access_token = <YOUR_FB_APP_ACCESS_TOKEN>

flaskapp/hello.py

def add_list_member(email,name):
    #Mail-gun api keys
	key = <YOUR_MAILGUN_API_KEY>
	domain = <YOUR_MAILGUN_DOMAIN>
	If it is sandbox domain, It will not sent mail to another mail ids, It's sends only authorized mail ids only.

Server setup: Enviroment settings and keys settings are completed, Now you need to add and run these files on your server(ex: AWS, heroku etc)and you will get url for this app.

I have added in heroku for testing purpose.
My heroku url for this app : https://getfbleadsapp.herokuapp.com

Once you done the setup and run the app successfully, you need to add php app for webhook callback url

Setup and run the phpapp app into your server and made few changes on webhook.php file

Here is the changes what will you make

phpapp/web/webhook.php

changes the verify token what you given while creating webhook on facebook page I have given 'abc123' in webhook.php

if ($verify_token == '<YOUR_VERIFY_TOKEN>'){
	echo $challenge;
}

You will get app url already(look at Server setup) , we need to change this url with your url.

$auth = curl_init("<YOUR_APP_URL>/".$frm_id);

I have deploy this php app also in heroku and got a url.

I have given that url while cretation of webhook on my sample page like

Callback URL
https://still-scrubland-39984.herokuapp.com/webhook.php

Verify Token
abc123

Callback URL: https://still-scrubland-39984.herokuapp.com/webhook.php

Verify Token: abc123

Work flow

we created a webhook for leadgen on facebook page with callback_url and Verify Token

when new lead creates that time the callback url fires functionality of webhook.php page

In webhook.php fires the app url with lead_gen data

then the app gets the new lead details and added to mail-gun mail list and send a mail to lead.

This is the working process.

For creating webhook on facebook page refer the following urls,

https://developers.facebook.com/docs/marketing-api/guides/lead-ads/retrieving/v2.8

Follow the video in this url or Run the follow using curl or graph-api explorer "https://developers.facebook.com/tools/explorer/198409723950483?method=GET&path=&version=v2.8"

curl
-F "object=page"
-F "callback_url=https://www.yourcallbackurl.com"
-F "fields=leadgen"
-F "verify_token=abc123"
-F "access_token=<APP_ACCESS_TOKEN>"
"https://graph.facebook.com/<API_VERSION>/<APP_ID>/subscriptions"

Thankyou.