Retrieves all available filter values for a specified product. This method is useful for discovering what part IDs, sizes, and colors are available before querying inventory levels.
Returns a Promise that resolves to the available filter values for the product. The response format depends on the client’s configured format option (JSON or XML).
Use this method before calling getInventoryLevels() to discover what filters are available for a product. This helps you build dynamic filter interfaces and avoid querying for non-existent variations.