How do I pay Netflix?

I got a 15 euro coupon for Netflix given. One month costs 8 euro. If I want to get Netflix one more time, I can't just pay it off my voucher. So I have to enter my bank details, but then I will only deducted 1 euro from the account or how does it work? Did jmd already have experience?

The rest will be deducted from the bank account. You can simply redeem another coupon.

Yes you will only be deducted 1 euro. Or you buy a voucher for 25 euro, then have 32 euro and then can look 4 months further