public function send( $force = false, $filter_types = null ) {

		$this->add_subscriptions( $filter_types );

		foreach ( $this->get_subscriptions() as $subscriber => $types ) {
			foreach ( $types as $type ) {
				/**
				 * Filter to determine if a notification should be sent to a subscriber.
				 *
				 * @since 9.0.0
				 */
				if ( ! apply_filters( 'llms_send_notification_to_subscriber', true, $this, $subscriber, $type, $this->post_id ) ) {
					continue;
				}

				$this->send_one( $type, $subscriber, $force );
			}
		}

		/**
		 * Cleanup subscriptions so if the notification
		 * is triggered again we don't have incorrect subscribers
		 * on the next trigger.
		 * This happens when receipts are triggered in bulk by action scheduler.
		 */
		$this->unset_subscriptions();
	}