To use your card on a purchase that totals more than the amount on the card, tell the cashier that you want to split the transaction and the current balance on your card. Then, use a different form of payment (cash, check, your own personal card, etc.) for the difference. Most stores will let you split a transaction, but it depends on their policy.
If an online merchant´s website doesn’t let you split the transaction, you can try calling the website´s customer service number. They may split the transaction for you over the phone.
For more information please check the Q&A section provided in your digital wallet (you will find the access link in your reward email).