code: public Observable<StorageAccountCredentialInner> createOrUpdateAsync(String deviceName, String name, String resourceGroupName, StorageAccountCredentialInner storageAccountCredential) {
          return createOrUpdateWithServiceResponseAsync(deviceName, name, resourceGroupName, storageAccountCredential).map(new Func1<ServiceResponse<StorageAccountCredentialInner>, StorageAccountCredentialInner>() {
              @Override
              public StorageAccountCredentialInner call(ServiceResponse<StorageAccountCredentialInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates the storage account credential.
  
  @param deviceName The device name.
  @param name The storage account credential name.
  @param resourceGroupName The resource group name.
  @param storageAccountCredential The storage account credential.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request