Credit Card capture at time of booking via web-embed calendar

Credit Card capture at time of booking via web-embed calendar

To deter no-shows and late cancellations we require clients to enter card info during the appt booking process... How can I implement that here as we begin using Charm?  (ideal workflow is to accept credit card payment at time of booking via the web-embedded feature).

Also, I've heard the Blue Fin doesn't accept HSA/FSA cards.  Is this correct?