gets the canonical registration id , if any . concode_field_sep String messageId concode_elem_sep String errorCode concode_elem_sep String canonicalRegistrationId concode_field_sep String getMessageId concode_elem_sep Result build concode_elem_sep Builder messageId concode_elem_sep Builder errorCode concode_elem_sep String toString concode_elem_sep String getErrorCodeName concode_elem_sep Builder canonicalRegistrationId
String function ( ) { return canonicalRegistrationId ; }