2. The method of claim 1 further comprising: verifying that the new best guess includes the correct account number by: sending a proposed account number associated with the new best guess to a financial institution; and receiving, from the financial institution, a confirmation that the proposed account number associated with the new best guess indicates valid account data.
2. The method of claim 1 further comprising: verifying that the new best guess includes the correct account number by: sending a proposed account number associated with the new best guess to a financial institution; and receiving, from the financial institution, a confirmation that the proposed account number associated with the new best guess indicates valid account data. 3. The method of claim 2 further comprising: sending the verified correct number associated with the new best guess to a server, wherein the server is configured to link the financial transaction card to a service provided by a payment service system by storing the verified correct account number associated with the new best guess, in a database, with an association to a user and the service provided by the payment service system.