def METHOD_NAME(content_type_id: 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[GetContentTypeResult]:
    """
    Gets the details of the developer portal's content type. Content types describe content items' properties, validation rules, and constraints.
    :param str content_type_id: Content type identifier.
    :param str resource_group_name: The name of the resource group. The name is case insensitive.
    :param str service_name: The name of the API Management service.
    """
    ...