Mobile device transaction systems and methods

A computer-implemented method, comprising:

• receiving, by a computer system, a first device token and a first customer token, the first device token identifying a mobile device and a first application session, the first customer token identifying a user;
• authorizing, by the computer system and based at least in part on the first device token or the first customer token, access to the user to the first application session;
• generating and providing, by the computer system and to the mobile device, a second device token identifying a second application session;
• receiving, by the computer system and during the first application session, a fund request from the mobile device;
• generating, by the computer system and during the first application session, an identification number based on the fund request, the identification number associated with an account of the user for a transaction;
• receiving, by the computer system and during the first application session, a received identification number from a card network computer system via the mobile device and an acquirer processor computer system;
• comparing, by the computer system and during the first application session, the generated identification number to the received identification number;
• generating, by the computer system and during the first application session, an approval in response to determining that the received identification number matches the generated identification number;
• and
• transmitting, by the computer system and during the first application session, the approval for the transaction to the card network computer system.