Multiple account advanced payment card and method of routing card transactions

A computer-implemented method for using a financial transaction device to access multiple accounts, comprising:

• issuing a financial transaction device to a cardholder wherein the financial transaction device stores machine readable data corresponding to a first account;
• processing, by a computer processor, a transaction initiated by the financial transaction device by reading the machine readable data;
• receiving a selection of a second account against which the transaction is to be processed, following the initiation of the transaction, wherein the second account is selected from at least one additional account associated with the cardholder and the at least one additional account differs from the first account;
• receiving a transaction request, based upon the transaction initiated by the financial transaction device, from a point of sale or merchant processor, wherein the transaction request comprises the machine readable data corresponding to the first account appended with the selection of the second account;
• and
• routing, by the computer processor, the transaction through a financial processing chain based on the selection of the second account appended in the transaction request wherein decision-making logic is applied in the processing chain to process the transaction request against the second account.