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The best way to do this is to Add add an Appointmentappointment for the customer into your Calendar, redeeming the eVoucher at the same time; this way, not only do you redeem the voucher, but you update your availability.
In the Calendar, select the appointment date and time (and Team member) you want to book the customer in for, and click Use an eVoucher. Enter the eVoucher code the customer gives you, and press Find. This redeems the eVoucher for you, and lets you book in the customer as normal.
You do also have the quick option to Redeem an eVoucher by clicking the green button on the Homepage and Calendar tabs. Just to note though, if you select to redeem your eVouchers this way, you don't close out the time in your Calendar so would need to do this as a second step to make sure we don't send a double booking to you.