protected function set_merge_data( $code ) {

		$quiz_id = $this->notification->get( 'post_id' );
		$attempt = $this->user->quizzes()->get_last_completed_attempt( $quiz_id );
		if ( ! $attempt ) {
			return '';
		}
		$lesson = llms_get_post( $attempt->get( 'lesson_id' ) );
		if ( ! $lesson ) {
			return '';
		}

		switch ( $code ) {

			case '{{COURSE_TITLE}}':
				$course = $lesson->get_course();
				if ( $course ) {
					$code = $course->get( 'title' );
				} else {
					$code = '';
				}
				break;

			case '{{GRADE}}':
				$code = round( $attempt->get( 'grade' ), 2 ) . '%';
				break;

			case '{{GRADE_BAR}}':
				$code = lifterlms_course_progress_bar( $attempt->get( 'grade' ), false, false, false );
				break;

			case '{{LESSON_TITLE}}':
				$code = $lesson->get( 'title' );
				break;

			case '{{QUIZ_TITLE}}':
				$code = get_the_title( $quiz_id );
				break;

			case '{{REVIEW_URL}}':
				$code = add_query_arg(
					array(
						'tab'        => 'quizzes',
						'stab'       => 'attempts',
						'quiz_id'    => $attempt->get( 'quiz_id' ),
						'attempt_id' => $attempt->get( 'id' ),
					),
					admin_url( 'admin.php?page=llms-reporting' )
				);
				break;

			case '{{STATUS}}':
				$code = $attempt->l10n( 'status' );
				break;

			case '{{STUDENT_NAME}}':
				$code = $this->is_for_self() ? __( 'you', 'lifterlms' ) : $this->user->get_name();
				break;

		}

		return $code;

	}