Omnipay\Common\CreditCard::getBirthday PHP Method

    public function getBirthday($format = 'Y-m-d')
    {
        $value = $this->getParameter('birthday');
        return $value ? $value->format($format) : null;
    }

 /**
  * Returns the payment parameters for standard credit card payments
  *
  * @param CreditCard $card
  * @return array
  */
 protected function getContactParams(CreditCard $card)
 {
     return ['ADDRESS.CITY' => $card->getBillingCity(), 'ADDRESS.COUNTRY' => $card->getBillingCountry(), 'ADDRESS.ZIP' => $card->getBillingPostcode(), 'ADDRESS.STATE' => $card->getBillingState(), 'ADDRESS.STREET' => $card->getBillingAddress1(), 'CONTACT.EMAIL' => $card->getEmail(), 'CONTACT.IP' => $card->getIp(), 'CONTACT.MOBILE' => $card->getBillingFax(), 'CONTACT.PHONE' => $card->getBillingPhone(), 'NAME.BIRTHDATE' => $card->getBirthday(), 'NAME.COMPANY' => $card->getCompany(), 'NAME.FAMILY' => $card->getLastName(), 'NAME.GIVEN' => $card->getFirstName(), 'NAME.SALUTATION' => '', 'NAME.TITLE' => ''];
 }