Memberful

Memberful, owned by Patreon, gives you a membership checkout system that lives on your own domain. It handles recurring billing, member authentication, and portal pages where subscribers manage their accounts and access locked content. The platform works with your existing website infrastructure and integrates with WordPress, Squarespace, and custom sites.

This fits course creators and membership communities who want branded checkout on their own site rather than a redirect. It's strongest for recurring revenue models, with flexible billing cycles and membership tier management. The Patreon backing means solid payment processing and regular feature updates.