pedroalbaladejo

I already found out how to edit your code example:

add_filter('mailpoet_newsletter_shortcode_link', 'mailpoet_custom_shortcode_referral_link', 10, 5);

function mailpoet_custom_shortcode_referral_link($shortcode, $newsletter, $subscriber, $queue, $arguments) {
  // always return the shortcode if it doesn't match your own!
  if ($shortcode !== '[link:referral]') return $shortcode;
  
    $email = $subscriber->getEmail();
    $name = $subscriber->getFirstName();

  $referral_link = "https://example.com/thanks/?email={$email}&name={$name}";
  
  return $referral_link;
}

Thanks anyway