def METHOD_NAME(app_name: Optional[pulumi.Input[str]] = None,
                             domain_name: 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[GetCustomDomainResult]:
    """
    Get the custom domain of one lifecycle application.
    Azure REST API version: 2023-05-01-preview.
    :param str app_name: The name of the App resource.
    :param str domain_name: The name of the custom domain resource.
    :param str resource_group_name: The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
    :param str service_name: The name of the Service resource.
    """
    ...