The use of the Django paginator classes is basically located in views. To stay a reusable generic app, django-postman code doesn't include a pagination feature but relies on external apps. django-pagination is a known candidate for that, with the benefit of isolation: the stuff is managed at middleware and template levels, so incurs no interference with the paginated app.
If you don't want to use another app, you may wrap django-postman views in your owns and overload the Context to add the pagination plumbing. But be conscious that you may finally write something already available as an external reusable app.