Omnipay\Common\Message\AbstractRequest::setAmount PHP Method

    public function setAmount($value)
    {
        return $this->setParameter('amount', $value);
    }

 /**
  * Workaround for https://github.com/thephpleague/omnipay-common/issues/13
  */
 public function setAmount($value)
 {
     if (is_float($value) && $value === 0.0) {
         $value = '0.00';
     }
     parent::setAmount($value);
 }