Using your voucher is easy! All you need to do is to take a ticket at entry, as normal. On exit, insert your entry ticket and then insert your voucher. Your voucher will either cover a certain amount or a certain period of time.
If you meet the conditions of the voucher, the system will accept your voucher as payment. If you have not met the conditions of the voucher, the system will not accept your voucher as payment and an alternate method of payment will be required.
To find out more about the conditions of the voucher you've received, please contact the voucher distributor. Eg. A medical centre.