FB messenger Bot not getting postback payloads - php

Question

I am developing a facebook chatbot. I am facing a issue which I cannot solve. I am developing this in laravel. Here I cannot get the postback payload. here is my code
public function index(Request $request) {
if ($request->hub_verify_token === $this->verifyToken) {
echo $request->hub_challenge;
exit;
}
$input = json_decode(file_get_contents("php://input"), true);
$senderId = $input['entry'][0]['messaging'][0]['sender']['id'];
$messageText = $input['entry'][0]['messaging'][0]['message']['text'];
$pageId = $input['entry'][0]['id'];
$accessToken = "access_token_that_got_from_fb";
//set Message
if($messageText != "") {
$answer = "Howdy! User";
}
if($messageText == "hello") {
$answer = 'Testing hello from bot';
}
foreach ($input['entry'][0]['messaging'] as $message) {
// When bot receive message from user
if (!empty($message['postback'])) {
$answer = 'got it tada';
}
}
//send message to facebook bot
$response = [
'recipient' => [ 'id' => $senderId ],
'message' => [ 'text' => $answer ] //json_encode($request->getContent())
];
$ch = curl_init('https://graph.facebook.com/v2.11/me/messages?access_token='.$accessToken);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($response));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
$result = curl_exec($ch);
curl_close($ch);
}
and my route is
Route::any('chatbot', 'ChatbotController#index');
here the message is working . but the postback payload request is not going to server. on the other hand using the same code in normal php file I am able to get postback paylod.
$hubVerifyToken = 'chatbot';
$accessToken = "access_token";
// check token at setup
if ($_REQUEST['hub_verify_token'] === $hubVerifyToken) {
echo $_REQUEST['hub_challenge'];
exit;
}
// handle bot's anwser
$input = json_decode(file_get_contents('php://input'), true);
$senderId = $input['entry'][0]['messaging'][0]['sender']['id'];
$messageText = $input['entry'][0]['messaging'][0]['message']['text'];
$postback = isset($input['entry'][0]['messaging'][0]['postback']['payload']) ? $input['entry'][0]['messaging'][0]['postback']['payload'] : '' ;
//set Message
if($messageText == "hi") {
$answer = "Hello";
}
if($messageText == "hello") {
$answer = "Hello there, welcome to Chatleads";
}
if($postback) {
$answer = "postback TADA";
}
//send message to facebook bot
$response = [
'recipient' => [ 'id' => $senderId ],
'message' => [ 'text' => $answer ]
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://graph.facebook.com/v2.11/me/messages?access_token=$accessToken");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($response));
curl_setopt($ch, CURLOPT_POST, 1);
$headers = array();
$headers[] = "Content-Type: application/json";
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$result = curl_exec($ch);
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
curl_close ($ch);
How to solve this issue? can anyone show me a path?

Answer 1

Solved it by checking at laravel.log file.
$this->messageText = isset($this->input['entry'][0]['messaging'][0]['message']['text']) ? $this->input['entry'][0]['messaging'][0]['message']['text'] : '' ;
messageText should be like this. that's why its causing an error.