Add option of gift vouchers#999

add option of gift vouchers

Absolutely needed. This gives our agency clients an ability to earn extra cach and for the end customer to redeem their voucher, either making the cost of their appointment cheaper or free depeneing on its value compared to the services being booked.

If the appointment could also display a badge “Voucher Redeemed” so that employees can see they paid for part/whole of the service with a voucher.