private function get_attribute_taxonomy_by_slug( $slug ) {
		$taxonomy = null;
		$attribute_taxonomies = wc_get_attribute_taxonomies();

		foreach ( $attribute_taxonomies as $key => $tax ) {
			if ( $slug == $tax->attribute_name ) {
				$taxonomy = 'pa_' . $tax->attribute_name;

				break;
			}
		}

		return $taxonomy;
	}