In our experience, the most common reason for a voucher failing to redeem on webuy.com is because the required details have not been entered correctly.
Usually, it is the value that has been entered wrong. You must enter the value of the voucher NOT the value of the transaction.
Details of how to redeem a voucher online can be found in this article HERE If you are still unable to redeem your voucher, please clear all cookies and use an updated browser to try again.
If you are still unable to redeem your voucher, please contact us via our support form.