API info:
Affiliates available via third-party add ons such as Rewardful:
How to integrate Rewardful (affiliate functionality)
Online community features available via Circle or Muut integrations:
Can I set up a private forum or community?
Info on setting up an online course with MemberSpace:
How to Create an Online Course with MemberSpace
Payment plan info:
Can my members have more than one recurring subscription?
Upsell info:
How to create upsells for members
Only differences between the Startup and Professional plans are as follows: