eventParticipants->getByIdentifier($participantIdentifier, $this->events); $signOffDate = DateTime::createFromFormat('Y-m-d', $request->input('cancel_date')); $signOffRequest = new SetParticipationStateSignoffRequest($participant, $signOffDate); $signOffCommand = new SetParticipationStateCommand($signOffRequest); $signOffCommand->execute(); return response()->json([ 'status' => 'success', 'identifier' => $participant->identifier, 'message' => 'Die Abmeldung wurde erfolgreich durchgeführt.' ]); } }