public static function shipping_classes_save_changes() {
		if ( ! isset( $_POST['wc_shipping_classes_nonce'], $_POST['changes'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		if ( ! wp_verify_nonce( wp_unslash( $_POST['wc_shipping_classes_nonce'] ), 'wc_shipping_classes_nonce' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		$changes = wp_unslash( $_POST['changes'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		foreach ( $changes as $term_id => $data ) {
			$term_id = absint( $term_id );

			if ( isset( $data['deleted'] ) ) {
				if ( isset( $data['newRow'] ) ) {
					// So the user added and deleted a new row.
					// That's fine, it's not in the database anyways. NEXT!
					continue;
				}
				wp_delete_term( $term_id, 'product_shipping_class' );
				continue;
			}

			$update_args = array();

			if ( isset( $data['name'] ) ) {
				$update_args['name'] = wc_clean( $data['name'] );
			}

			if ( isset( $data['slug'] ) ) {
				$update_args['slug'] = wc_clean( $data['slug'] );
			}

			if ( isset( $data['description'] ) ) {
				$update_args['description'] = wc_clean( $data['description'] );
			}

			if ( isset( $data['newRow'] ) ) {
				$update_args = array_filter( $update_args );
				if ( empty( $update_args['name'] ) ) {
					continue;
				}
				$inserted_term = wp_insert_term( $update_args['name'], 'product_shipping_class', $update_args );
				$term_id       = is_wp_error( $inserted_term ) ? 0 : $inserted_term['term_id'];
			} else {
				wp_update_term( $term_id, 'product_shipping_class', $update_args );
			}

			do_action( 'woocommerce_shipping_classes_save_class', $term_id, $data );
		}

		$wc_shipping = WC_Shipping::instance();

		wp_send_json_success(
			array(
				'shipping_classes' => $wc_shipping->get_shipping_classes(),
			)
		);
	}