public function get_columns() {
		return array(
			'cb'            => '<input type="checkbox" />',
			'title'         => __( 'Description', 'woocommerce' ),
			'truncated_key' => __( 'Consumer key ending in', 'woocommerce' ),
			'user'          => __( 'User', 'woocommerce' ),
			'permissions'   => __( 'Permissions', 'woocommerce' ),
			'last_access'   => __( 'Last access', 'woocommerce' ),
		);
	}