A method includes receiving, by a provider computing system from an initiating device, an encrypted network return address of an user device that identifies a network address of the user device; receiving, by the provider computing system and from the user device, an encryption key configured to decrypt the encrypted network return address; decrypting, by the provider computing system, the encrypted network return address using the encryption key; and providing, by the provider computing system, a code to the user device based on the decrypted network return address by transmitting the code to the user device without going through the initiating device.