How can I purchase online with two Visa gift cards?

I have about $10 left on one visa gift card, and about $15 on another...I want to purchase something online, but I need to use both of the gift cards. However, I am not able to enter both of them at the checkout. Does anyone know how I can use the money on both of these cards to make my purchase?

How can I purchase online with two Visa gift cards?
Go online and register the gift cards. I recieved a whole bunch this Christmas myself, Commerce Bank Visa Gift Card, and I just went to whichever site they showed on the back of the card. I think mine was commercegiftcards.com. I went there and they explain how you can check the balance or shop online with your card. Hope I was helpful!
Reply:There's probably a customer service number you can call. You may also want to consider paying for it over the phone, if using the two cards online isn't possible.
Reply:you could call that business on the phone and tell them that you have 2 gift cards that you want to use and they might be able to manually enter the info for you
Reply:After you enter one, it should still have a remaining balance, then you enter the other one. I did that with some other gift cards I had.