$iATS_CL = new iATSCustomerLink($agentCode, $password,'NA');
$request = array(
  'customerIPAddress' => '',
  'customerCode' => '0000019805',
  'email' => 'email@test.co',
  'recurring' => FALSE,
  'beginDate' => $iATS_CL->getFormattedDate($beginTime),
  'endDate' => $iATS_CL->getFormattedDate($endTime),
  'creditCardNum' => '4222222222222220',
  'updateCreditCardNum' => FALSE,
);

$response = $iATS_CL->updateCreditCardCustomerCode($request);