def METHOD_NAME(name: Optional[pulumi.Input[str]] = None,
                                         resource_group_name: Optional[pulumi.Input[str]] = None,
                                         resource_name: Optional[pulumi.Input[str]] = None,
                                         opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetWebPubSubCustomDomainResult]:
    """
    Get a custom domain.
    :param str name: Custom domain name.
    :param str resource_group_name: The name of the resource group. The name is case insensitive.
    :param str resource_name: The name of the resource.
    """
    ...