public function send_non_attendance_confirmation( $order_id, $event_id ) {

		$attendees = $this->get_attendees_by_order_id( $order_id );

		if ( empty( $attendees ) ) {
			return;
		}

		// For now all ticket holders in an order share the same email
		$to = $attendees['0']['holder_email'];

		if ( ! is_email( $to ) ) {
			return;
		}

		/**
		 * Filters the non attending RSVP tickets email headers
		 *
		 * @since 4.5.2 added new parameters $event_id and $order_id
		 * @since 4.5.5 changed filter name to be unique to non attendance emails
		 *
		 * @param array  email headers
		 * @param int    $event_id
		 * @param int    $order_id
		 */
		$headers = apply_filters( 'tribe_rsvp_non_attendance_email_headers', array( 'Content-type: text/html' ), $event_id, $order_id );

		/**
		 * Filters the non attending RSVP tickets email attachments
		 *
		 * @since 4.5.2 added new parameters $event_id and $order_id
		 * @since 4.5.5 changed filter name to be unique to non attendance emails
		 *
		 * @param array  attachments
		 * @param int    $event_id
		 * @param int    $order_id
		 */
		$attachments = apply_filters( 'tribe_rsvp_non_attendance_email_attachments', array(), $event_id, $order_id );

		/**
		 * Filters the non attending RSVP tickets email recepient
		 *
		 * @since 4.5.2 added new parameters $event_id and $order_id
		 * @since 4.5.5 changed filter name to be unique to non attendance emails
		 *
		 * @param string  $to
		 * @param int     $event_id
		 * @param int     $order_id
		 */
		$to = apply_filters( 'tribe_rsvp_non_attendance_email_recipient', $to, $event_id, $order_id );

		/**
		 * Filters the non attending RSVP tickets email subject
		 *
		 * @since 4.5.2 added new parameters $event_id and $order_id
		 * @since 4.5.5 changed filter name to be unique to non attendance emails
		 *
		 * @param string
		 * @param int     $event_id
		 * @param int     $order_id
		 */
		$subject = apply_filters( 'tribe_rsvp_non_attendance_email_subject',
			sprintf( __( 'You confirmed you will not be attending %s', 'event-tickets' ), get_the_title( $event_id ) ),
			$event_id,
			$order_id
		);

		$template_data = array( 'event_id' => $event_id, 'order_id' => $order_id, 'attendees' => $attendees );

		/**
		 * Filters the non attending RSVP tickets email content
		 *
		 * @since 4.5.2 added new parameters $event_id and $order_id
		 * @since 4.5.5 changed filter name to be unique to non attendance emails
		 *
		 * @param string  email content
		 * @param int     $event_id
		 * @param int     $order_id
		 */
		$content = apply_filters( 'tribe_rsvp_non_attendance_email_content',
			tribe_tickets_get_template_part( 'tickets/email-non-attendance', null, $template_data, false ),
			$event_id,
			$order_id
		);

		wp_mail( $to, $subject, $content, $headers, $attachments );
	}