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  private appointmentEndPoint$ = this.configurationService.fetch(
    config => config.appointmentsEndpoint
  );
  private serverUrl = this.configurationService.fetch(config => config.serverUrl);
  
  private createNapErrorMessage(error: GenericAppError): NAPMessage {
    return {
      date: new Date().toISOString(),
      id: UUID(),
      event: {
        type: NAPEventCatalogue.v1.SessionError,
        context: [
          {
            resource: {
              resourceType: FHIRValueSetter.FHIRResourceType.Basic,
              code: {
                coding: [
                  {
                    code: NAPEventCatalogue.v1.SessionError,
                    system: FHIRValueSetter.FHIRSystem.NAP,
                  },
                ],
              },
              identifier: [
                {
                  system: FHIRValueSetter.FHIRIdentifierSystem.NAPErrorMessage,
                  value: error.innerError?.message ? error.innerError?.message : '',
                },
                {
                  system: FHIRValueSetter.FHIRIdentifierSystem.NAPErrorDescription,
                  value: error.errorMessage,
                },
              ],
            },
          },
        ],
      }
    }
  }

  public getAppointments(patientIdentifier: string | undefined): Observable<any[] | undefined> {
    return combineLatest(
      [
        this.serverUrl,
        this.appointmentEndPoint$,
        this.serviceActivator
      ]
    ).pipe(
      switchMap(([serverUrl, endpointPath, _]) => this.http.get<any[]>(serverUrl + endpointPath + '/' + patientIdentifier)),
      catchError(error => {
        this.errorService.postError(error);
        this.napSDK.sendMessage(this.createNapErrorMessage(error)); // indicate to the host that something went wrong
        return of(undefined);
      }),
    );
  }