Welcome to your interview.
The question is on your right: Balance Speed and Fraud Risk. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
What metrics would you track to balance user experience (speed of transfer) with risk mitigation (fraud prevention)?