PayPal\Api\Payment::getRedirectUrls PHP Method

    public function getRedirectUrls()
    {
        return $this->redirect_urls;
    }

 public static function addTrackingParameters(Payment $payment)
 {
     $redirectUrls = $payment->getRedirectUrls();
     $url = new Url($redirectUrls->getReturnUrl());
     $url->setQueryParameter('utm_nooverride', 1);
     $redirectUrls->setReturnUrl($url->getAbsoluteUrl());
     $payment->setRedirectUrls($redirectUrls);
     return $payment;
 }