def begin_create_or_update(resource_group_name, virtual_wanname, wanparameters, custom_headers:nil)
      response = begin_create_or_update_async(resource_group_name, virtual_wanname, wanparameters, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def begin_create_or_update(resource_group_name, virtual_wanname, wanparameters, custom_headers:nil)
      response = begin_create_or_update_async(resource_group_name, virtual_wanname, wanparameters, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
Creates a VirtualWAN resource if it doesn't exist else updates the existing
 VirtualWAN.

 @param resource_group_name [String] The resource group name of the
 VirtualWan.
 @param virtual_wanname [String] The name of the VirtualWAN being created or
 updated.
 @param wanparameters [VirtualWAN] Parameters supplied to create or update
 VirtualWAN.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [VirtualWAN] operation results.