PayPal\PayPalAPI\GetExpressCheckoutDetailsReq::toXMLString PHP Method

    public function toXMLString()
    {
        $str = '';
        $str .= '<ns:GetExpressCheckoutDetailsReq>';
        if ($this->GetExpressCheckoutDetailsRequest != null) {
            $str .= '<ns:GetExpressCheckoutDetailsRequest>';
            $str .= $this->GetExpressCheckoutDetailsRequest->toXMLString();
            $str .= '</ns:GetExpressCheckoutDetailsRequest>';
        }
        $str .= '</ns:GetExpressCheckoutDetailsReq>';
        return $str;
    }