gets the multi-factor authentication device serial number . concode_field_sep String deviceSerialNumber concode_elem_sep String token concode_field_sep void setDeviceSerialNumber concode_elem_sep void setToken concode_elem_sep String getToken concode_elem_sep MultiFactorAuthentication withDeviceSerialNumber concode_elem_sep MultiFactorAuthentication withToken
String function ( ) { return deviceSerialNumber ; }