WhatsApp booking means arranging a session by message, in one written thread that carries the hour, the fee and any deposit, with Telegram as an alternative.
The booking line is a message thread, not a call centre. You write, and the answer comes back in that same thread. There is no switchboard to wait on and no call to schedule. How long an answer takes depends on the hour and on the request, so a booking for later tonight goes more smoothly with a little room to spare. Telegram carries the same kind of thread for clients who prefer it.
Five lines. A message that holds all five is usually confirmed without a single follow-up question.
An acceptance, or another time if the requested hour is taken. The fee in euros. Where a deposit applies, its exact amount and the payment details, in that thread and nowhere else. Then the timing: the arrival window for a booking wanted now, a fixed start for a later one.
A thread is a record both sides can scroll back through. The agreed fee, the deposit figure, the address and any change of time each sit in writing beside a timestamp. That protects the client from a misheard number and the therapist from a vague address. It also makes the house's payment requests easy to recognise, since none arrives by any other route. A demand for money from outside the confirmed thread is not from the office.
The booking page walks through the order of messages from first request to arrival.