What information should be entered in the reference field of the FIS vendor invoice for the payment to be applied correctly by AMEX?
For payment to be processed correctly by AMEX, the “reference” field of the FIS vendor invoice should be populated with the 15 digit AMEX account number only. The reference field is the ONLY field that prints on the cheque stub. If that field is not appropriately populated, AMEX will not know where to apply the payment. The AMEX account number is located on the AMEX statement, and the whole number (all 15 digits) should be entered in the reference field (i.e. not just the last 5 digits).