Guy on phone always gives you this second code at the beginning of night when you enter first code in Night 7 (also like I said I believe completing first code night is also % but you don’t have to actually finish it to get second code. It’s quite easy night though). And the first code is the same as in original FNAF code for golden freddy jumpscare.
That should take 5 seconds to google and yet I didn’t give it right away xD