src/Bigcommerce/Api/Client.php
public static function getSkusByProduct($productId, $filter = array())
    {
        $filter = Filter::create($filter);
        return self::getCollection('/products/'.$productId.'/skus' . $filter->toQuery(), 'Sku');
    }
public static function getSkusByProduct($productId, $filter = array())
    {
        $filter = Filter::create($filter);
        return self::getCollection('/products/'.$productId.'/skus' . $filter->toQuery(), 'Sku');
    }
public static function getSkusByProduct ( $ productId , $ filter = array ( ) ) { $ filter = Filter :: create ( $ filter ) ; return self :: getCollection ( '/products/' . $ productId . '/skus' . $ filter -> toQuery ( ) , 'Sku' ) ; }
Get collection of product skus by Product

@param $productId
@param array $filter
@return mixed
Get collection of product skus by Product