Abstract: Systems and methods are described for identifying users of a network-enabled point of service (“POS”) without requiring the POS to collect user identifying information. A mobile computing device detects a POS identifier (“POS-ID”) associated with a POS device. The mobile computing device transmits information including the POS-ID to a user identification server. The network-enabled POS device transmits further information including transaction data to the user identification server. The user identification server compares the data received from the POS device and the data received from the mobile computing device to determine a correlation and identify the POS and the user as parties to a transaction. The user identification server may determine which of several POS devices and/or users were parties to a transaction, and may provide information regarding the correlated transactions to the POS, the user, or to authorized third parties.