score:2
I am regularly buying domestic and international tickets for other people, on various airlines, including Condor; using my Credit Card (I'd never use a Debit Card online). There never were any issues.
When they ask for passenger name, enter their name; when they ask for payment, enter your credit card and your name.
Note that this might depend on the country the flight starts from; but as Condor is a German airline, your flights are probably starting from Germany, and they do not ask to see the credit card that was used for payment.
My last buy at Condor was in Nov 2016. things could have changed, but I doubt it. My last buys at United and SW were this week.