Hi,
Thank you for your interest in SP Booking.
At present, SP Booking does not include a built-in option to collect a partial payment, fixed deposit, or percentage of the total amount during checkout. The customer can either pay the full booking amount through an available payment gateway or use the Pay Later option.
To support deposit payments, such as collecting 20% or a fixed amount at the time of booking and the remaining balance later, custom development would currently be required.
We appreciate the suggestion and will forward it to the development team for consideration in a future update.
-Regards.