How to make Appointments+ Payment required for Booking usable?

Have appointments+ running on my site, and everything works great - except what I actually purchased it for, which is making it easy for clients to pre-pay up front :slight_frown:

Clients have been coming to the site, hitting the confirm booking button, and then leaving without seeing the extra Paypal button quietly and unobtrusively pop up below.

Has anyone figured out a way to use this feature without client loss? We've switched to taking payments manually in the meantime, which is really not ideal.