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

		if ( ! wp_verify_nonce( wp_unslash( $_POST['wc_shipping_zones_nonce'] ), 'wc_shipping_zones_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();
		}

		global $wpdb;

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

		if ( isset( $changes['zone_name'] ) ) {
			$zone->set_zone_name( wc_clean( $changes['zone_name'] ) );
		}

		if ( isset( $changes['zone_locations'] ) ) {
			$zone->clear_locations( array( 'state', 'country', 'continent' ) );
			$locations = array_filter( array_map( 'wc_clean', (array) $changes['zone_locations'] ) );
			foreach ( $locations as $location ) {
				// Each posted location will be in the format type:code.
				$location_parts = explode( ':', $location );
				switch ( $location_parts[0] ) {
					case 'state':
						$zone->add_location( $location_parts[1] . ':' . $location_parts[2], 'state' );
						break;
					case 'country':
						$zone->add_location( $location_parts[1], 'country' );
						break;
					case 'continent':
						$zone->add_location( $location_parts[1], 'continent' );
						break;
				}
			}
		}

		if ( isset( $changes['zone_postcodes'] ) ) {
			$zone->clear_locations( 'postcode' );
			$postcodes = array_filter( array_map( 'strtoupper', array_map( 'wc_clean', explode( "\n", $changes['zone_postcodes'] ) ) ) );
			foreach ( $postcodes as $postcode ) {
				$zone->add_location( $postcode, 'postcode' );
			}
		}

		if ( isset( $changes['methods'] ) ) {
			foreach ( $changes['methods'] as $instance_id => $data ) {
				$method_id = $wpdb->get_var( $wpdb->prepare( "SELECT method_id FROM {$wpdb->prefix}woocommerce_shipping_zone_methods WHERE instance_id = %d", $instance_id ) );

				if ( isset( $data['deleted'] ) ) {
					$shipping_method = WC_Shipping_Zones::get_shipping_method( $instance_id );
					$option_key      = $shipping_method->get_instance_option_key();
					if ( $wpdb->delete( "{$wpdb->prefix}woocommerce_shipping_zone_methods", array( 'instance_id' => $instance_id ) ) ) {
						delete_option( $option_key );
						do_action( 'woocommerce_shipping_zone_method_deleted', $instance_id, $method_id, $zone_id );
					}
					continue;
				}

				$method_data = array_intersect_key(
					$data,
					array(
						'method_order' => 1,
						'enabled'      => 1,
					)
				);

				if ( isset( $method_data['method_order'] ) ) {
					$wpdb->update( "{$wpdb->prefix}woocommerce_shipping_zone_methods", array( 'method_order' => absint( $method_data['method_order'] ) ), array( 'instance_id' => absint( $instance_id ) ) );
				}

				if ( isset( $method_data['enabled'] ) ) {
					$is_enabled = absint( 'yes' === $method_data['enabled'] );
					if ( $wpdb->update( "{$wpdb->prefix}woocommerce_shipping_zone_methods", array( 'is_enabled' => $is_enabled ), array( 'instance_id' => absint( $instance_id ) ) ) ) {
						do_action( 'woocommerce_shipping_zone_method_status_toggled', $instance_id, $method_id, $zone_id, $is_enabled );
					}
				}
			}
		}

		$zone->save();

		wp_send_json_success(
			array(
				'zone_id'   => $zone->get_id(),
				'zone_name' => $zone->get_zone_name(),
				'methods'   => $zone->get_shipping_methods( false, 'json' ),
			)
		);
	}