Axepta allow 3DSV2 transactions so the parameter Msgver=2.0

You can change only function BfishCompose :

public function BfishCompose(array $parameters)

{

// compose Blowfish hex string

$blowfishString = '';

foreach($parameters as $key) {

if(array_key_exists($key, $this->parameters) && !empty($this->parameters[$key])) {

$value = $this->parameters[$key];

$blowfishString .= $key.'='.$value.'&';

}

//add this

$blowfishString.='MsgVer=2.0&';

$blowfishString = rtrim($blowfishString,'&');

$this->parameters['Debug'] = $blowfishString;

$this->parameters['Len'] = strlen($blowfishString);

$this->parameters[self::DATA_FIELD] = bin2hex($this->encrypt($blowfishString,$this->cryptKey));

return $this->parameters[self::DATA_FIELD];

}