function llms_update_520_upcoming_reminder_notification_backward_compat() {

	$subscribers_for_type = array(
		'email' => array(
			'student',
		),
		'basic' => array(
			'student',
			'author',
			'custom',
		),
	);

	foreach ( $subscribers_for_type as $type => $subscribers ) {
		add_option( "llms_notification_upcoming_payment_reminder_{$type}_subscribers", array_fill_keys( $subscribers, 'no' ) );
	}

	return false;

}