public function set_columns() {

		return array(
			'name'         => __( 'Name', 'lifterlms' ),
			'status'       => __( 'Status', 'lifterlms' ),
			'topic'        => __( 'Topic', 'lifterlms' ),
			'delivery_url' => __( 'Delivery URL', 'lifterlms' ),
		);

	}