remove coupon for specific user role

functions.php

<?php
add_filter('gens_raf_should_remove_coupon','gens_raf_code',10,3);
function gens_raf_code($should_remove,$guest_coupon_code,$referrer_id) {
  
  if( is_user_logged_in() ) {
    $user = wp_get_current_user();
    $roles = ( array ) $user->roles;
    if($roles[0] === "wholesale-customer") {
      return true;
    }
  }
  return $should_remove;
}