Systems and methods for converting account portfolios from one processing network to another

A translation service computing device comprising a processor in communication with a memory, said processor programmed to:

• store first account data in the memory along with a corresponding translation identifier, the first account data associated with a first payment processing network (PPN);
• receive an authorization request message during a transaction initiated by a cardholder using a payment card, the authorization request message including transaction data associated with the transaction and second account data associated with the payment card and a second PPN, the second account data including the translation identifier;
• translate the second account data to the first account data by performing a lookup within the memory using the translation identifier;
• generate a translated authorization request message including the transaction data and the first account data;
• and
• transmit the translated authorization request message to an issuer bank.

At least one non-transitory computer-readable media having computer-executable instructions embodied thereon, wherein when executed by at least one processor, the computer-executable instructions cause the at least one processor to:

• store first account data in a memory along with a corresponding translation identifier, the first account data associated with a first payment processing network (PPN);
• receive an authorization request message during a transaction initiated by a cardholder using a payment card, the authorization request message including transaction data associated with the transaction and second account data associated with the payment card and a second PPN, the second account data including the translation identifier;
• translate the second account data to the first account data by performing a lookup within the memory using the translation identifier;
• generate a translated authorization request message including the transaction data and the first account data;
• and
• transmit the translated authorization request message to an issuer bank.