Integration with webflow

I am trying to connect our ghost site to webflow which we are using as the course platform. I am trying to restrict access only to paid members on the webflow course platform using the subscription access for paid members on my ghost site. I’m using ghost as a blog and webflow for courses. I’ve tried using Zapier but the functionality options in Zapier do not allow me to select “paid” members. It will only let me integrate a created member, which defeats the purpose because my free subscribers would also have access to our courses. Any suggestions on a work around? I know ghost has the capacity to do courses, but I like webflow better for our course content. Any advice is greatly appreciated.