<form method="POST">
    <h3>Editing: ProductsById.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
namespace Automattic\WooCommerce\StoreApi\Routes\V1;

use Automattic\WooCommerce\StoreApi\Exceptions\RouteException;

/**
 * ProductsById class.
 */
class ProductsById extends AbstractRoute {
	/**
	 * The route identifier.
	 *
	 * @var string
	 */
	const IDENTIFIER = 'products-by-id';

	/**
	 * The routes schema.
	 *
	 * @var string
	 */
	const SCHEMA_TYPE = 'product';

	/**
	 * Get the path of this REST route.
	 *
	 * @return string
	 */
	public function get_path() {
		return self::get_path_regex();
	}

	/**
	 * Get the path of this rest route.
	 *
	 * @return string
	 */
	public static function get_path_regex() {
		return '/products/(?P&lt;id&gt;[\d]+)';
	}

	/**
	 * Get method arguments for this REST route.
	 *
	 * @return array An array of endpoints.
	 */
	public function get_args() {
		return [
			'args'   =&gt; array(
				'id' =&gt; array(
					'description' =&gt; __( 'Unique identifier for the resource.', 'woocommerce' ),
					'type'        =&gt; 'integer',
				),
			),
			[
				'methods'             =&gt; \WP_REST_Server::READABLE,
				'callback'            =&gt; [ $this, 'get_response' ],
				'permission_callback' =&gt; '__return_true',
				'args'                =&gt; array(
					'context' =&gt; $this-&gt;get_context_param(
						array(
							'default' =&gt; 'view',
						)
					),
				),
			],
			'schema' =&gt; [ $this-&gt;schema, 'get_public_item_schema' ],
		];
	}

	/**
	 * Get a single item.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 * @return \WP_REST_Response
	 */
	protected function get_route_response( \WP_REST_Request $request ) {
		$object = wc_get_product( (int) $request['id'] );

		if ( ! $object || 0 === $object-&gt;get_id() ) {
			throw new RouteException( 'woocommerce_rest_product_invalid_id', __( 'Invalid product ID.', 'woocommerce' ), 404 );
		}

		return rest_ensure_response( $this-&gt;schema-&gt;get_item_response( $object ) );
	}
}
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