Easy Affiliate - Pay higher commission if user signed up AFTER affiliate

esaf-commission-user-joined-after-aff.php

<?php
add_filter('esaf_commission_percentages', function ($commission, $affiliate, $transaction) {
  if($transaction) {
    $user = get_user_by('email', $transaction->cust_email);

    if($user && strtotime($user->user_registered) > strtotime($affiliate->user_registered)) {
      $commission = array(30);
    }
  }

  return $commission;
}, 50, 3);