public RegistrationInPharmacy Create(RegistrationInPharmacyDto dto)
        {
            RegistrationInPharmacy registration = RegistrationInPharmacyAdapter.RegistrationDtoToRegistration(dto);

            if (isApiKeyUnique(registration.ApiKey))
            {
                return(RegistrationInPharmacyRepository.Create(registration));
            }
            return(null);
        }