Abstract: A method for processing a split payment transaction funded by a plurality of transaction accounts includes: storing a primary account number, funding rules, and a plurality of funding account numbers; receiving a primary transaction including the primary account number and a primary transaction amount; calculating a secondary transaction amount for each account based on the primary transaction amount and funding rules; generating a transaction message for a secondary transaction for each funding account number including the associated secondary transaction amount; transmitting the transaction message for each secondary transaction; receiving a response message for each secondary transaction including a response code; generating a response message for the primary transaction including a response code that (i) indicates approval of the primary transaction if each secondary transaction was approved, or (ii) indicates denial of the primary transaction if at least one secondary transaction was denied; and transmit