Measure a payment-routing change you rolled out country-wide
Measure impactHardProblem. For operational reasons, a payment-routing change (new acquirer for a country's card traffic) shipped to everyone in that country at once — no user-level control. Leadership asks its true impact on approval and cost. How do you measure it?
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.