Combine Netflix gift card with direct debit?

I have a question about the payment method / methods at Netflix:

If you buy the most expensive subscription for 15.99 euro and you have a 15 euro voucher card, how can you withdraw the remaining 0.99 euro? Is it possible to top up his Netflix account with the 15 euro credit card and then simply withdraw the remaining 0.99 euro by direct debit or is that not possible?

No, unfortunately not! D:

I don't want to write a lot for reading.