public static function all($page = 1, $per_page = 10)
    {
        $collections = self::get(
            "/collections",
            ['query' => ['page' => $page, 'per_page' => $per_page]]
        );

        $collectionsArray = self::getArray($collections->getBody(), get_called_class());

        return new ArrayObject($collectionsArray, $collections->getHeaders());
    }