At booking
Pay in full, or pay a retainer with the balance to follow
When you book, you can either settle the full fee straight away or pay a smaller, non-refundable retainer to secure your date — with the remaining balance due seven days before the session.
Which option you see depends on the session type you pick. The booking page shows you the exact amount before you confirm anything, so there's no guessing.
One small note: if you're booking within seven days of the session date, the full fee is due at booking. The retainer-plus-balance plan needs more breathing room than that to work cleanly.