One of the most tedious tasks when setting up a new project is to implement the whole payment flow and subscription management. Especially for a SaaS backend which needs to know about the current subscription state of every single user.
Launchr, the Open Source SaaS starter template for Django, now has full Stripe integration. I've updated the code last week and just finished the first iteration on the documentation for it.
If Django is your go-to framework or if your are new to web development and want to create your first SaaS, make sure to check it out. It's also on GitHub.