1 euro on voucherkarte to load?

I bought a Netflix card worth 15 euro from Rewe, but I need 16 euro for Netflix. Can I still charge 1 euro?

If not, you have a tip what else to do, because I do not want to buy one directly.

As far as I know, that does not work. The cards all have a specific value. But you can simply put the one euro by direct debit, the voucher covers the rest.