Since we setup with Phorest Tips, our team are missing out on tips that clients would like to leave by using their card, but are actually paying for their services with vouchers. Is there a 'Tip' tab that can be added to the purchase screen that will allow clients just leave a tip using their card via the payment terminal, without us having to enter the amount? This was a concern of a client today; they didn't like the idea of us at the desk knowing how much they were leaving in tips!