Find out if it's your customer that owns the ATM or not. In my experience, if your customer does not own the ATM, they at least know who does because they get some sort of financial compensation for having the ATM located on their premises. If your customer owns it, they need to complete a questionnaire because you need to find out who is filling that ATM (a third part or if it's your customer who is filling it from banking withdrawals or from their till).