If your purchase amount comes to more than the available funds in your Zip account, you'll need to make a copayment to cover the difference in order to complete the purchase.
How to make a copayment instore
You can pay the difference via cash or card, depending on which payment methods the store accepts.
How to make a copayment online
You'll be prompted to enter an alternative payment method to cover the difference. Your copayment needs to come from a debit card.
Once your copayment has been accepted, the balance will be charged to your Zip account.