I have a SaaS startup and was wondering what the bare minimum would be to publish it on the Google apps marketplace. My app currently authenticates users on its own, but I'm willing to implement Google single sign on. On the pricing front my customers purchase "credits" via PayPal - there's no signup or subscription fee. Will Google marketplace allow this given that they won't get any commission? Or will I be required to change my system so users buy credits through Google?
There are a number of optional integrations. But (today) the only one that is required is Single Sign On.
All the details can be found in Google's documentation. It specifically mentions SSO as a requirement: