At the time I sent coin diver the code Netflix was still accepting them, I offered him 50% compensation as a good gesture. Although he's been pretty vocal I don't owe him shit.
Your agreement was that he will send you BTC, and you will give him a code.
It DOESN'T MATTER that this source of yours messed up. WE DON'T CARE. If you don't want to be responsible, put a disclaimer saying that.