code: public Observable<ServiceResponse<IssuerBundle>> setCertificateIssuerWithServiceResponseAsync(String vaultBaseUrl, String issuerName, String provider) {
          if (vaultBaseUrl == null) {
              throw new IllegalArgumentException("Parameter vaultBaseUrl is required and cannot be null.");
          }
          if (issuerName == null) {
              throw new IllegalArgumentException("Parameter issuerName is required and cannot be null.");
          }
          if (this.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.apiVersion() is required and cannot be null.");
          }
          if (provider == null) {
              throw new IllegalArgumentException("Parameter provider is required and cannot be null.");
          }
          final IssuerCredentials credentials = null;
          final OrganizationDetails organizationDetails = null;
          final IssuerAttributes attributes = null;
          CertificateIssuerSetParameters parameter = new CertificateIssuerSetParameters();
          parameter.withProvider(provider);
          parameter.withCredentials(null);
          parameter.withOrganizationDetails(null);
          parameter.withAttributes(null);
          String parameterizedHost = Joiner.on(", ").join("{vaultBaseUrl}", vaultBaseUrl);
          return service.setCertificateIssuer(issuerName, this.apiVersion(), this.acceptLanguage(), parameter, parameterizedHost, this.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<IssuerBundle>>>() {
                  @Override
                  public Observable<ServiceResponse<IssuerBundle>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<IssuerBundle> clientResponse = setCertificateIssuerDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Sets the specified certificate issuer.
  The SetCertificateIssuer operation adds or updates the specified certificate issuer. This operation requires the certificates/setissuers permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param issuerName The name of the issuer.
  @param provider The issuer provider.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the IssuerBundle object