A financial transaction computing system can include an ATM and a prestaging module. The ATM can have one or more processors, a first transceiver, one or more cash cassettes, a slot exposed on an exterior of the ATM and communicating with the one or more cash cassettes, and a banknote dispensing module at least configured to move banknotes from the one or more cash cassettes to the slot. The pre-staging module can have one or more processors, a first memory, and a second transceiver. The pre-staging module can also be configured to communicate with the ATM over a wireless public network to receive a token from the ATM over the wireless public network. The pre-staging module can be configured to retrieve a pre-staged transaction from the first memory in response to receiving the token from the ATM.