PayPal\Api\Authorization::setAmount PHP Method

    public function setAmount($amount)
    {
        $this->amount = $amount;
        return $this;
    }

 public static function createAuthorization()
 {
     $authorization = new Authorization();
     $authorization->setCreateTime(self::$create_time);
     $authorization->setId(self::$id);
     $authorization->setState(self::$state);
     $authorization->setAmount(AmountTest::createAmount());
     $authorization->setLinks(array(LinksTest::createLinks()));
     return $authorization;
 }