How to Save quiz attempt Step data in Moodle?

I am writing a custom Moodle (2.6) web service for taking up the moodle quiz, that requires to create an attempt or start an attempt. I written the API to start an attempt as well as get the questions for a particular quiz. However I m not able to figure out how to save the User responses for the question attempt. (Question attempt step data). Will appreciate if anyone can help me. //Fetch all the user attempts $attempts = quiz_get_user_attempts($quizObj->get_quizid(), 3, 'all', true); //Get the last attempt $lastattempt = end($attempts); // Delete any previous preview attempts belonging to this user. quiz_delete_previews($quizObj->get_quiz(), $USER->id); //fetch the quiz usage object $quba = question_engine::make_questions_usage_by_activity('mod_quiz', $quizObj->get_context()); $quba->set_preferred_behaviour($quizObj->get_quiz()->preferredbehaviour); // Create the new attempt and initialize the question sessions $timenow = time(); // Update time now, in case the server is running really slowly. $attempt = quiz_create_attempt($quizObj, $attemptnumber, $lastattempt, $timenow, $quizObj->is_preview_user()); if ($lastAttemptStatus == quiz_attempt::FINISHED) { $attemptnumber = $lastattempt->attempt + 1; $attempt = quiz_start_new_attempt($quizObj, $quba, $attempt, $attemptnumber, $timenow); } elseif ($lastAttemptStatus == quiz_attempt::IN_PROGRESS) { $attempt = quiz_start_attempt_built_on_last($quba, $attempt, $lastattempt); } // It is here Lets say I would like to hardcode (get param) the responses from the user for a quiz for a specific question must go.. and I have add these responses as attempt step data.. $transaction = $DB->start_delegated_transaction(); $attempt = quiz_attempt_save_started($quizObj, $quba, $attempt); quiz_fire_attempt_started_event($attempt, $quizObj); $transaction->allow_commit(); $lastattempt = end($attempts);