Does AMZN Allow Split Payments?

therealjrn thought this was worth mentioning said
3

I’ve received a couple of $30 “virtual” Visa debit cards by doing surveys on a product I bought. I’m not linking the deal because it was invitation only through a coupon in the product.

But the first one I received last month I used on AMZN to buy something for $19.20 which should mean I have $10.80 left. The other virtual card I just now received is worth $30. I should be getting a few more as I do the monthly surveys.

What do I do with the change left on the cards? Can I stack them on AMZN?