PayPal\Api\PayerInfo::setLastName PHP Method

    public function setLastName($last_name)
    {
        $this->last_name = $last_name;
        return $this;
    }

 public static function createPayerInfo()
 {
     $payerInfo = new PayerInfo();
     $payerInfo->setEmail(self::$email);
     $payerInfo->setFirstName(self::$firstName);
     $payerInfo->setLastName(self::$lastName);
     $payerInfo->setPhone(self::$phone);
     $payerInfo->setPayerId(self::$payerId);
     $payerInfo->setShippingAddress(AddressTest::createAddress());
     return $payerInfo;
 }