Sofortüberweisung without an online bank account?

I just bought a monthly subscription on Twitch with instant transfer, my question: I only have a normal Gicrocard but no online bank account, how can I pay it and does that have any consequences?

No, can't be paid. Sofortüberweisung can only be used with online banking

Just set up an online bank account. It's not a big deal and even free xD

But I have already received a confirmation but not where I have to pay for it

Is that possible with a Gicro account? Do not know me from xD

Just ask at the bank. That's why they sit in front of the counter.