Interoperable mobile wallet refund

A computer-implemented method, comprising:

• receiving, by a merchant computer system associated with a merchant, a message from a point of sale (POS) device, the message identifying a transaction between the merchant and a payor and including an amount of funds associated with the transaction;
• determining, by the merchant computer system, that the transaction is a refund transaction based on the message;
• determining, by the merchant computer system, a previously used token based on the message, the previously used token associated with the transaction;
• and
• transmitting, by the merchant computer system, the previously used token to a recipient bank computer system.

A computer-implemented method, comprising:

• receiving, by a merchant computer system associated with a merchant, a first message from a point of sale (POS) device, the first message identifying a transaction between the merchant and a payor and including an amount of funds associated with the transaction;
• determining, by the merchant computer system, that the transaction is a refund transaction based on the first message;
• transmitting, by the merchant computer system, a second message to a recipient bank computer system, the second message identifying the transaction as the refund transaction;
• receiving, by the merchant computer system, an approval or decline indication for the refund transaction after transmitting the second message to the recipient bank computer system;
• and
• transmitting, by the merchant computer system, the approval or decline indication to the POS device.