public function get_columns() {
		$columns = array(
			'timestamp'       => __( 'Timestamp', 'woocommerce' ),
			'product'         => __( 'Product', 'woocommerce' ),
			'file'            => __( 'File', 'woocommerce' ),
			'order'           => __( 'Order', 'woocommerce' ),
			'user'            => __( 'User', 'woocommerce' ),
			'user_ip_address' => __( 'IP address', 'woocommerce' ),
		);

		return $columns;
	}