lter-unset-1'.
				$filter_value = $duotone_attr; // e.g. 'unset'.

				// Just block CSS.
				self::enqueue_block_css( $filter_id, $duotone_selector, $filter_value );
			} elseif ( $is_custom ) {
				$slug         = wp_unique_id( sanitize_key( implode( '-', $duotone_attr ) . '-' ) ); // e.g. '000000-ffffff-2'.
				$filter_id    = self::get_filter_id( $slug ); // e.g. 'wp-duotone-filter-000000-ffffff-2'.
				$filter_value = self::get_filter_url( $filter_id ); // e.g. 'url(#wp-duotone-filter-000000-ffffff-2)'.
				$filter_data  = array(
					'slug'   => $slug,
					'colors' => $duotone_attr,
				);

				// SVG filter and block CSS.
				self::enqueue_custom_filter( $filter_id, $duotone_selector, $filter_value, $filter_data );
			}
		} elseif ( $has_global_styles_duotone ) {
			$slug         = $global_styles_block_names[ $block['blockName'] ]; // e.g. 'blue-orange'.
			$filter_id    = self::get_filter_id( $slug ); // e.g. 'wp-duotone-filter-blue-orange'.
			$filter_value = self::get_css_var( $slug ); // e.g. 'var(--wp--preset--duotone--blue-orange)'.

			// CSS custom property, SVG filter, and block CSS.
			self::enqueue_global_styles_preset( $filter_id, $duotone_selector, $filter_value );
		}

		// Like the layout hook, this assumes the hook only applies to blocks with a single wrapper.
		$tags = new WP_HTML_Tag_Processor( $block_content );
		if ( $tags->next_tag() ) {
			$tags->add_class( $filter_id );
		}
		return $tags->get_updated_html();
	}

	/**
	 * Appends the used block duotone filter declarations to the inline block supports CSS.
	 *
	 * Uses the declarations saved in earlier calls to self::enqueue_block_css.
	 *
	 * @since 6.3.0
	 */
	public static function output_block_styles() {
		if ( ! empty( self::$block_css_declarations ) ) {
			wp_style_engine_get_stylesheet_from_css_rules(
				self::$block_css_declarations,
				array(
					'context' => 'block-supports',
				)
			);
		}
	}

	/**
	 * Appends the used global style duotone filter presets (CSS custom
	 * properties) to the inline global styles CSS.
	 *
	 * Uses the declarations saved in earlier calls to self::enqueue_global_styles_preset.
	 *
	 * @since 6.3.0
	 */
	public static function output_global_styles() {
		if ( ! empty( self::$used_global_styles_presets ) ) {
			wp_add_inline_style( 'global-styles', self::get_global_styles_presets( self::$used_global_styles_presets ) );
		}
	}

	/**
	 * Outputs all necessary SVG for duotone filters, CSS for classic themes.
	 *
	 * Uses the declarations saved in earlier calls to self::enqueue_global_styles_preset
	 * and self::enqueue_custom_filter.
	 *
	 * @since 6.3.0
	 */
	public static function output_footer_assets() {
		if ( ! empty( self::$used_svg_filter_data ) ) {
			echo self::get_svg_definitions( self::$used_svg_filter_data );
		}

		// In block themes, the CSS is added in the head via wp_add_inline_style in the wp_enqueue_scripts action.
		if ( ! wp_is_block_theme() ) {
			$style_tag_id = 'core-block-supports-duotone';
			wp_register_style( $style_tag_id, false );
			if ( ! empty( self::$used_global_styles_presets ) ) {
				wp_add_inline_style( $style_tag_id, self::get_global_styles_presets( self::$used_global_styles_presets ) );
			}
			if ( ! empty( self::$block_css_declarations ) ) {
				wp_add_inline_style( $style_tag_id, wp_style_engine_get_stylesheet_from_css_rules( self::$block_css_declarations ) );
			}
			wp_enqueue_style( $style_tag_id );
		}
	}

	/**
	 * Adds the duotone SVGs and CSS custom properties to the editor settings.
	 *
	 * This allows the properties to be pulled in by the EditorStyles component
	 * in JS and rendered in the post editor.
	 *
	 * @since 6.3.0
	 *
	 * @param array $settings The block editor settings from the `block_editor_settings_all` filter.
	 * @return array The editor settings with duotone SVGs and CSS custom properties.
	 */
	public static function add_editor_settings( $settings ) {
		$global_styles_presets = self::get_all_global_styles_presets();
		if ( ! empty( $global_styles_presets ) ) {
			if ( ! isset( $settings['styles'] ) ) {
				$settings['styles'] = array();
			}

			$settings['styles'][] = array(
				// For the editor we can add all of the presets by default.
				'assets'         => self::get_svg_definitions( $global_styles_presets ),
				// The 'svgs' type is new in 6.3 and requires the corresponding JS changes in the EditorStyles component to work.
				'__unstableType' => 'svgs',
				// These styles not generated by global styles, so this must be false or they will be stripped out in wp_get_block_editor_settings.
				'isGlobalStyles' => false,
			);

			$settings['styles'][] = array(
				// For the editor we can add all of the presets by default.
				'css'            => self::get_global_styles_presets( $global_styles_presets ),
				// This must be set and must be something other than 'theme' or they will be stripped out in the post editor <Editor> component.
				'__unstableType' => 'presets',
				// These styles are no longer generated by global styles, so this must be false or they will be stripped out in wp_get_block_editor_settings.
				'isGlobalStyles' => false,
			);
		}

		return $settings;
	}

	/**
	 * Migrates the experimental duotone support flag to the stabilized location.
	 *
	 * This moves `supports.color.__experimentalDuotone` to `supports.filter.duotone`.
	 *
	 * @since 6.3.0
	 *
	 * @param array $settings Current block type settings.
	 * @param array $metadata Block metadata as read in via block.json.
	 * @return array Filtered block type settings.
	 */
	public static function migrate_experimental_duotone_support_flag( $settings, $metadata ) {
		$duotone_support = _wp_array_get( $metadata, array( 'supports', 'color', '__experimentalDuotone' ), null );

		if ( ! isset( $settings['supports']['filter']['duotone'] ) && null !== $duotone_support ) {
			_wp_array_set( $settings, array( 'supports', 'filter', 'duotone' ), (bool) $duotone_support );
		}

		return $settings;
	}

	/**
	 * Gets the CSS filter property value from a preset.
	 *
	 * Exported for the deprecated function wp_get_duotone_filter_id().
	 *
	 * @internal
	 *
	 * @since 6.3.0
	 * @deprecated 6.3.0
	 *
	 * @param array $preset The duotone preset.
	 * @return string The CSS filter property value.
	 */
	public static function get_filter_css_property_value_from_preset( $preset ) {
		_deprecated_function( __FUNCTION__, '6.3.0' );

		if ( isset( $preset['colors'] ) && is_string( $preset['colors'] ) ) {
			return $preset['colors'];
		}

		$filter_id = self::get_filter_id_from_preset( $preset );

		return 'url(#' . $filter_id . ')';
	}
}
on get_route_response( \WP_REST_Request $request ) {
		throw new RouteException( 'woocommerce_rest_invalid_endpoint', __( 'Method not implemented', 'woocommerce' ), 404 );
	}

	/**
	 * Get route response for POST requests.
	 *
	 * When implemented, should return a \WP_REST_Response.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 */
	protected function get_route_post_response( \WP_REST_Request $request ) {
		throw new RouteException( 'woocommerce_rest_invalid_endpoint', __( 'Method not implemented', 'woocommerce' ), 404 );
	}

	/**
	 * Get route response for PUT requests.
	 *
	 * When implemented, should return a \WP_REST_Response.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 */
	protected function get_route_update_response( \WP_REST_Request $request ) {
		throw new RouteException( 'woocommerce_rest_invalid_endpoint', __( 'Method not implemented', 'woocommerce' ), 404 );
	}

	/**
	 * Get route response for DELETE requests.
	 *
	 * When implemented, should return a \WP_REST_Response.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 */
	protected function get_route_delete_response( \WP_REST_Request $request ) {
		throw new RouteException( 'woocommerce_rest_invalid_endpoint', __( 'Method not implemented', 'woocommerce' ), 404 );
	}

	/**
	 * Get route response when something went wrong.
	 *
	 * @param string $error_code String based error code.
	 * @param string $error_message User facing error message.
	 * @param int    $http_status_code HTTP status. Defaults to 500.
	 * @param array  $additional_data  Extra data (key value pairs) to expose in the error response.
	 * @return \WP_Error WP Error object.
	 */
	protected function get_route_error_response( $error_code, $error_message, $http_status_code = 500, $additional_data = [] ) {
		return new \WP_Error( $error_code, $error_message, array_merge( $additional_data, [ 'status' => $http_status_code ] ) );
	}

	/**
	 * Get route response when something went wrong and the supplied error is a WP_Error. This currently only happens
	 * when an item in the cart is out of stock, partially out of stock, can only be bought individually, or when the
	 * item is not purchasable.
	 *
	 * @param WP_Error $error_object The WP_Error object containing the error.
	 * @param int      $http_status_code HTTP status. Defaults to 500.
	 * @param array    $additional_data  Extra data (key value pairs) to expose in the error response.
	 * @return WP_Error WP Error object.
	 */
	protected function get_route_error_response_from_object( $error_object, $http_status_code = 500, $additional_data = [] ) {
		$error_object->add_data( array_merge( $additional_data, [ 'status' => $http_status_code ] ) );
		return $error_object;
	}

	/**
	 * Prepare a single item for response.
	 *
	 * @param mixed            $item Item to format to schema.
	 * @param \WP_REST_Request $request Request object.
	 * @return \WP_REST_Response $response Response data.
	 */
	public function prepare_item_for_response( $item, \WP_REST_Request $request ) {
		$response = rest_ensure_response( $this->schema->get_item_response( $item ) );
		$response->add_links( $this->prepare_links( $item, $request ) );

		return $response;
	}

	/**
	 * Retrieves the context param.
	 *
	 * Ensures consistent descriptions between endpoints, and populates enum from schema.
	 *
	 * @param array $args Optional. Additional arguments for context parameter. Default empty array.
	 * @return array Context parameter details.
	 */
	protected function get_context_param( $args = array() ) {
		$param_details = array(
			'description'       => __( 'Scope under which the request is made; determines fields present in response.', 'woocommerce' ),
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_key',
			'validate_callback' => 'rest_validate_request_arg',
		);

		$schema = $this->get_item_schema();

		if ( empty( $schema['properties'] ) ) {
			return array_merge( $param_details, $args );
		}

		$contexts = array();

		foreach ( $schema['properties'] as $attributes ) {
			if ( ! empty( $attributes['context'] ) ) {
				$contexts = array_merge( $contexts, $attributes['context'] );
			}
		}

		if ( ! empty( $contexts ) ) {
			$param_details['enum'] = array_unique( $contexts );
			rsort( $param_details['enum'] );
		}

		return array_merge( $param_details, $args );
	}

	/**
	 * Prepares a response for insertion into a collection.
	 *
	 * @param \WP_REST_Response $response Response object.
	 * @return array|mixed Response data, ready for insertion into collection data.
	 */
	protected function prepare_response_for_collection( \WP_REST_Response $response ) {
		$data   = (array) $response->get_data();
		$server = rest_get_server();
		$links  = $server::get_compact_response_links( $response );

		if ( ! empty( $links ) ) {
			$data['_links'] = $links;
		}

		return $data;
	}

	/**
	 * Prepare links for the request.
	 *
	 * @param mixed            $item Item to prepare.
	 * @param \WP_REST_Request $request Request object.
	 * @return array
	 */
	protected function prepare_links( $item, $request ) {
		return [];
	}

	/**
	 * Retrieves the query params for the collections.
	 *
	 * @return array Query parameters for the collection.
	 */
	public function get_collection_params() {
		return array(
			'context' => $this->get_context_param(),
		);
	}
}