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<?php/*Created by MmuoDev.
 */
 require_once 'classes/botClass.php';
 require_once 'classes/constants.php';
 
 if (isset($_GET['hub_verify_token'])) {
 if ($_GET['hub_verify_token'] ===  VERIFY_TOKEN) { //Token entered during setup. It is defined as a constant in  constants.php
 echo $_GET['hub_challenge'];
 return;
 } else {
 echo 'Invalid Verify Token';
 return;
 }
 }
 $accessToken = ACCESS_TOKEN; //Access token generated by Facebook. It is defined as a constant in constants.php.
 $bot = new botClass(); //Initialize an object of the bot class
 $input = json_decode(file_get_contents('php://input'), true); //JSON decode messages received
 $bot->setAccessToken($accessToken);
 $message = $bot->readMessage($input); //Call the method that reads messages
 $bot->sendMessage($message); //Call the method that sends messages
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