Currently, We do not have the facility for customers to enter voucher/discount codes on Happity. However this is something we are looking at for the future and we would love to hear from you as to how you would like this feature to work. Email us with your suggestions and we will consider these when developing this new feature.
In the meantime, we do have the option for several different types of tickets including 'Trial offer' tickets so that you can offer discounted prices to first time customers etc.
See also