My friend want to apply for UK visit visa. But he doesn't have certificate. Could it affect his visa application
This seems like a scam
While the question is very short, this looks like it could be the case of a common scam where a "friend" you met online wants to visit you / fell in love with you / is going to give you several millions, yet argues to need to pay for some supporting documents (or even bribe their officials) before exiting the country, thus slowly getting money for the victim with different excuses.