A financial transaction authentication server includes a wireless network interface that is configured to receive fund transfer requests from a buyer via a wireless communications terminal, a wireless terminal location module that is configured to identify the respective locations of the buyer and a seller, and a transaction authorization processor configured to authorize a transfer request if the geographic locations of wireless terminals of the buyer and seller are within a predetermined geographical proximity of each other. The wireless network terminal location module identifies the geographic locations of respective wireless terminals of the buyer and seller. The transaction authorization processor authorizes a fund transfer request if the respective locations of buyer and seller wireless terminals are within a predetermined geographical proximity and suspends a fund transfer request if respective locations of buyer and seller wireless terminals are not within a predetermined geographical proximity of each other.