Take advance payment while booking for client
1. Go to Calendar >> staff calendar
2. Click on New Booking
Generate an appointment for the client
3. Add Client Name
4. Select Service which he/she needs to take
5. Select Staff Member and Timing of the appointment
Now Clients paying you the payment for booking. though, they not availing it. In that case you can select Payment Method, it can be through online UPI gateways
In last Click on Save
The appointment will be booked with paid status and when client is visiting, change the booking status to complete and save that.
Also, here is the video tutorial for your reference