You can now let clients add a tip to their payment when booking online. Full Slate’s online payment feature lets you accept payments from clients 
when they book appointments online. With this added functionality, they can add a tip to the price of the service and the combined cost will be charged to their credit card.
The tip option will only be presented to clients when they pay for the appointment in full.
Your clients can then relax when attending their appointment with no worries about payment.
To enable tips, simply check the “Accept tips” box under Setup > Client Payments.