def METHOD_NAME(backendid: Optional[pulumi.Input[str]] = None,
                       resource_group_name: Optional[pulumi.Input[str]] = None,
                       service_name: Optional[pulumi.Input[str]] = None,
                       opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetBackendResult]:
    """
    Gets the details of the backend specified by its identifier.
    :param str backendid: Identifier of the Backend entity. Must be unique in the current API Management service instance.
    :param str resource_group_name: The name of the resource group.
    :param str service_name: The name of the API Management service.
    """
    ...