If you have a session with a practitioner, then an invoice will be incurred and your credit card will be charged at the end of the bi-monthly billing period during which your session occurred.
Bi-monthly billing dates are always the same 1-15 Billed on the 17th. Then all sessions billed on the 16th thru last day of the month are always billed on the 2nd of the next month.
Statements are sent out on the 2nd after all billing is completed
You are not billed if you do not have a session with a practitioner.