Fixes the item not found error by using filter in the product endpoint

includes/API/ProductCatalog/Products/Id/Request.php

@@ -8,9 +8,9 @@
 defined( 'ABSPATH' ) || exit;
 
 /**
- * Request object for Product Catalog > Product Groups > Products > Update Graph Api.
+ * Request object for Product Catalog > Products > Get Graph Api.
  *
- * @link https://developers.facebook.com/docs/marketing-api/reference/product-group/products/
+ * @link https://developers.facebook.com/docs/marketing-api/reference/product-catalog/products/
  */
 class Request extends ApiRequest {
 
@@ -19,7 +19,14 @@ class Request extends ApiRequest {
 	 * @param string $facebook_product_retailer_id Facebook Product Retailer ID.
 	 */
 	public function __construct( string $facebook_product_catalog_id, string $facebook_product_retailer_id ) {
-		$path = "catalog:{$facebook_product_catalog_id}:" . base64_encode( $facebook_product_retailer_id ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
-		parent::__construct( "/{$path}/?fields=id,product_group{id}", 'GET' );
+		$path = "/{$facebook_product_catalog_id}/products";
+		parent::__construct( $path, 'GET' );
+
+		$this->set_params(
+			array(
+				'filter' => '{"retailer_id": {"eq": "'.$facebook_product_retailer_id.'"}}',
+				'fields' => 'id,product_group{id}',
+			)
+		);
 	}
 }