Our platform has no integrated payment solution built-in. However, you can create something for this yourself quite easily. Our product has a feature called meeting types, for example "30-minute training" or "15-minute topic X consultation". You could basically sell these on your website and once purchased allow them access to the booking form to book that meeting type.
To get inspired to find a workaround to still add paid bookings you can watch this video from someone who found a way to implement it.