code: def get_supported_types(resource_root, category_name):
    
    return call(resource_root.get,
        EXTERNAL_ACCOUNT_FETCH_PATH % ("supportedTypes", category_name,),
        ApiExternalAccountType, True)
docs: Lookup all supported types in a category.
    @param resource_root: The root Resource object.
    @param category_name: The category name
    @return: An ApiExternalAcccountType list