Implementation of https://discuss.api.ai/t/fulfilment-using-webhook-takes-time-to-get-the-data/3726/31

fulfillment.php

<?php
function print_api_ai_response($speech, $display_text = null, $followup_event = null, $context=null) {
  $for_api_ai = array();
  $for_api_ai['speech'] = $speech;

  if ($display_text != null) {
    $for_api_ai['displayText'] = $display_text;
  } else {
    $for_api_ai['displayText'] = $speech;
  }

  // {"followupEvent":{"name":"<event_name>","data":{"<parameter_name>":"<parameter_value>"}}}
  if ($followup_event != null) {
    $for_api_ai['followupEvent'] = array(
      'name'=> $followup_event
    );
  }

  if ($context != null) {
    $for_api_ai['contextOut'] = $context;
  }
  $for_api_ai['data'] = '';
  $for_api_ai['source'] = 'myfulfillment';

  $response = json_encode($for_api_ai);

  error_log($response);
  echo $response;
} // print_api_ai_response

$request_body = file_get_contents('php://input');
$request_array = json_decode($request_body, true);

$intent_name = $request_array['result']['metadata']['intentName'];
$session_id = $request_array['sessionId'];
$filename = $session_id . '_response.txt';

error_log("Intent: $intent_name Session ID: $session_id");

if ($intent_name == 'result_ready') {
  /*
   * we have invoked this intent by sending "RESULT_READY" event.
   * read the session-id and return corresponding contents from file.
   */
  error_log('result_ready intent found.');
  if (file_exists($filename)) {
    $response = file_get_contents($filename);
    print_api_ai_response($response);
    ob_flush();
    unlink($filename);
  } else {
    print_api_ai_response("working on it...", null, 'RESULT_READY');
  }
}

if ($intent_name == "start_scorecard") {
  $arr = start_scorecard(); // this function actually does the job and returns response text.
  $context = array(
    array(
      "name" => "my-report-context",
      "lifespan" => 5,
      "parameters" => array("report_id" => $arr['report_id'])
    )
  );
  // per documentation, if context is provided, speech is not spoken and displayText is not shown.
  print_api_ai_response($arr['speech'], $arr['displayText'], null, $context);
}
?>