code: public String getPendingCertificateSigningRequest(String vaultBaseUrl, String certificateName) {
          return getPendingCertificateSigningRequestWithServiceResponseAsync(vaultBaseUrl, certificateName).toBlocking()
                  .single().body();
      }
docs: Gets the pending certificate signing request response.
  
  @param vaultBaseUrl
  The vault name, e.g. https://myvault.vault.azure.net
  @param certificateName
  The name of the certificate
  @return the String if successful.