Fulfilment response PHP webhook not showing up in Actions on Google - php

Question

The fulfilment response is visible in diagnostic info in the Dialogflow environment. But it's not showing up when I test it in Actions on Google. Anyone who knows how to let it work? Here is my webhook code:
<?php
$method = $_SERVER['REQUEST_METHOD'];
if($method == 'POST'){
$requestBody = file_get_contents('php://input');
$json = json_decode($requestBody);
$text = $json->queryResult->queryText;
$date = (!empty($json->queryResult->parameters->date)) ? $json->queryResult->parameters->date : '';
$environment = (!empty($json->queryResult->parameters->environment)) ? $json->queryResult->parameters->environment : '';
$intent = (!empty($json->queryResult->intent->displayName)) ? $json->queryResult->intent->displayName : '';
$responseText = prepareResponse($intent, $text, $date, $environment);
$response = new \stdClass();
$response->speech = $responseText;
$response->displayText = $responseText;
$response->source = "webhook";
header("Content-type:application/json");
echo json_encode($response);
}
else
{
echo "Method not allowed";
}
function prepareResponse($intent, $text, $date, $environment)
{
return "You said: " . $text . " | I found Intent: " . $intent . " | with parameters: date=" . $date . " environment=" . $environment;
}
?>

Answer 1

Responses for Actions on Google should be in an object under the payload attribute that contains a single attribute google with the AoG response format.
I haven't tested it, and this may not be the best way to build it, but something like the following should work:
$response->payload = array(
"google" => array(
"expectUserResponse" => TRUE,
"richResponse" => array(
"items" => array(
array(
"simpleResponse" => array(
"textToSpeech" => $responseText
)
)
)
)
)
);