Hi,
Take a look at these:
I’ve used Get Omnify at it was fabulous! Full functioning as a standalone with integration for a site. On the pricey side but for sure one of the top applications to use.
A member service would work even better. Try Memberstack since it’s built for Webflow! I can’t wait to actually use this. You can build inside of Webflow and members can manage their own account.
Just add payment options for appointments that they can confirm via email. Booking apps will do the same, but Memberstack is inside Webflow.
Hope this helps ya 