def begin_create_or_update(resource_group_name, vm_scale_set_name, vmss_extension_name, extension_parameters, custom_headers:nil)
      response = begin_create_or_update_async(resource_group_name, vm_scale_set_name, vmss_extension_name, extension_parameters, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def begin_create_or_update(resource_group_name, vm_scale_set_name, vmss_extension_name, extension_parameters, custom_headers:nil)
      response = begin_create_or_update_async(resource_group_name, vm_scale_set_name, vmss_extension_name, extension_parameters, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
The operation to create or update an extension.

 @param resource_group_name [String] The name of the resource group.
 @param vm_scale_set_name [String] The name of the VM scale set where the
 extension should be create or updated.
 @param vmss_extension_name [String] The name of the VM scale set extension.
 @param extension_parameters [VirtualMachineScaleSetExtension] Parameters
 supplied to the Create VM scale set Extension operation.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [VirtualMachineScaleSetExtension] operation results.