When you present a valid CASHlib voucher code for payment at a Participating Merchant website or on the CASHlib website, CASHlib provides an online validation of the code enabling your payment to be confirmed. If the value of your CASHlib voucher code is greater than the transaction you are using it to pay for vouchers, simply enter each PIN one at a time when paying to use their combined value. This is also the best way to use up any remaining balance.