What is the "Identification Number" required to pick up a reserved ticket, when purchased on the JR WEST ONLINE TRAIN RESERVATION website?

The "Identification number" required when picking up tickets reserved through the JR WEST ONLINE TRAIN RESERVATION, at a "Midori [Green] ticket vending machine", etc., is a random 4-digit number generated by the customer when making a reservation. If the Identification number cannot be confirmed or forgotten, please pick up the ticket at the station counter.
※The pickup location varies depending on the tickets. Please check them individually.