I have a website build with webflow cms : www.fiberbooks.com we are offering 100+ non-fiction book summaries against 16 Turkish lira monthly fee.
There are several options out there ( https://restrictcontentpro.com/ ) but most of them working on WordPress.
Premium Content managment can doable in webflow cms?
If possible I need a developer to make it. Tinypass or any other options we can discuss for right tool.