[Answered ]-Django-storages and boto and REST

django-storages is a drop-in replacement for Django’s FileSystem storage class, allow you to transparently upload images and files to S3 buckets (and various other storage systems). It uses Boto to connect to Amazon Web Services under the hood.

DevPay is completely separate from S3/Boto/django-storages. I’ve never used it personally, but you might want to have a look at Stripe. Simple. Effective. Very easy to integrate into Django.