When a customer uses your FlexBooker online booking form, they have the ability to log in using the account they set up while purchasing a membership:
When booking, they will be presented with the usual booking screen. If the customer has a membership which covers this particular booking, they will receive a message informing them that their booking is covered under their plan.
If the customer does not have a membership plan, or their plan has been used or does not cover this booking, they will have to enter a payment method to complete the booking.