Your question is ATM Refill System Design. 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).
Design an ATM refill system: there is an app that lists all the ATMs that need refilling; design it (mobile architecture plus backend high-level design).
Asked in the system design stage. Define requirements and cover backend HLD questions. For the mobile architecture, explain whether a domain layer with use cases is appropriate. A reported follow-up was: Which layer would you write the mapper function, mapping data DTO to domain DTO, in?