If I redeem the netflix gift code will the remaining money on it?

If I redeem the netflix gift code will the remaining money on it?

Nothing is left over on the map. The entire amount will be transferred to your Netflix account.

What about the remaining money? Will it be used for next month or will it just go away unnecessarily?

This will be used for the next month if it is enough. But if you have only 1 euro on it, that's not enough. Either you have to get another card, or the 1 euro goes away for free.