public function update() {
		if ( empty( $this->paypal_order_id ) ) {
			return false;
		}

		$meta_input = array(
			$this->hashed_meta_key           => array(),
			self::$meta_prefix . 'attendees' => wp_list_pluck( $this->attendees, 'attendee_id' ),
		);

		foreach ( $this->meta as $key => $value ) {
			if ( in_array( $key, $this->searchable_meta_keys ) ) {
				$key                = self::$meta_prefix . $key;
				$meta_input[ $key ] = $value;
			} else {
				$meta_input[ $this->hashed_meta_key ][ $key ] = $value;
			}
		}

		if ( empty( $this->status ) ) {
			$this->status = Tribe__Tickets__Commerce__PayPal__Stati::$undefined;
		}

		$postarr = array(
			'post_type'   => Tribe__Tickets__Commerce__PayPal__Main::ORDER_OBJECT,
			'post_title'  => $this->paypal_order_id,
			'post_status' => $this->status,
			'meta_input'  => $meta_input,
		);

		/**
		 * Filters the post array that will be saved to the database for the Order post.
		 *
		 * @since 4.7
		 *
		 * @param array                                   $postarr
		 * @param Tribe__Tickets__Commerce__PayPal__Order $order
		 */
		$postarr = apply_filters( 'tribe_tickets_tpp_order_postarr', $postarr, $this );

		if ( empty( $this->post_id ) ) {
			$post_id = wp_insert_post( $postarr );
		} else {
			// remove any existing PayPal meta before the update
			global $wpdb;
			$wpdb->query(
				$wpdb->prepare(
					"DELETE FROM {$wpdb->postmeta} WHERE post_id = %d and meta_key LIKE %s",
					$this->post_id,
					self::$meta_prefix . '%'
				)
			);
			wp_cache_delete( $this->post_id, 'post_meta' );

			$postarr['ID'] = $this->post_id;

			$post_id = wp_update_post( $postarr );
		}

		if ( ! empty( $post_id ) ) {
			foreach ( $this->ticket_ids as $ticket_id ) {
				add_post_meta( $post_id, self::$meta_prefix . 'ticket', $ticket_id );
			}

			foreach ( $this->post_ids as $related_post_id ) {
				add_post_meta( $post_id, self::$meta_prefix . 'post', $related_post_id );
			}
		}
	}