Hide referral link for customers without any order

Via wpgens_raf_link filter, you can show referral link to specific customers. In this example, we are hiding referral link for customers that have zero orders. 

add_filter('wpgens_raf_link','gens_raf_link',10,3);
function gens_raf_link($raf_link, $referral_id, $type) {
	$user_id = get_current_user_id();
	if($user_id == 0) {
		return;
	}
	$customer_orders = get_posts( array(
	    'numberposts' => 999,
	    'meta_query' => array(
			array(
				'key'    => '_customer_user',
	    		'value'  => $user_id,
			),
		),
	    'post_type'   => wc_get_order_types(),
	    'post_status' => 'wc-completed',
	) );

	if(count($customer_orders) < 1) {
		return "You need at least one order for referral link";
	} else {
		return $raf_link;
	}
}

You can use similar code to hide referral links per user roles. Contact us if you need help.