A WhatsApp booking keeps the whole arrangement in one written thread: the request, the reply naming her, any deposit details and every later change.
Nobody at this house expects you to make a phone call at three in the morning. Bookings are made in writing, in a WhatsApp thread with the office, and Telegram works the same way for anyone who prefers it. Writing suits the hour: you can send it from a hotel bed without saying a word aloud, and everything agreed stays there to scroll back through.
Plain words are welcome. Every possible way of asking has been written before, and none of them needs an apology.
A written reply, in the same thread. If a therapist takes the booking, the confirmation sets out her name, the timing, the price and, where one applies, the deposit figure along with its payment details. Those details appear only inside this confirmed thread and only after acceptance. A message offering payment details from any other number or profile is not from the house, however convincing it looks.
That same thread carries everything afterwards: a gate code, a change of room, a note that you will wait for her downstairs. Keep changes there rather than opening a fresh conversation, so the office always holds the complete picture of the booking. The booking page sets out the order in which the messages arrive, and the FAQ answers the questions people most often send first.