Your question is Diagnosing a Sudden Volume Drop. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are supporting a payments business that sees a sharp overnight decline in card and bank transfer activity in one region. Leadership wants a fast read on whether this is a real business issue, a data issue, or an operational incident, and what to check first.
If our transaction volume in a specific region drops by 15% overnight, what is your step-by-step diagnostic framework to find the root cause?