UseModule UseModule allows to change class module. It might be useful when you need to serialize/deserialize the class and fastapi-pagination is not able to correctly resolve the module of the class. from typing import TypeVar from fastapi_pagination import Page from fastapi_pagination.customization import CustomizedPage, UseModule T = TypeVar("T") CustomPage = CustomizedPage[ Page[T], UseModule("my_module"), ] print(CustomPage.__module__)