Faster Payments enablement guide - NatWest

Appendix B: Faster Payments ISO8583 Format
ISO8583
If you opt to receive a separate Faster Payments file, you can receive this in the same format as your existing
CAS file, or, you can receive the information in ISO8583 format. This is the industry format used by the member
banks to pass payment data to and from the Central Infrastructure.
It provides a greater level of detail than your normal CAS file format.
If you initially opt for CAS format, you can migrate to ISO8583 format at any time, and parallel running will
be available.
The list below is a sample of some of the additional information available in the ISO8583 format compared
to CAS. A full file specification document is included in the pack.
Additional Information provided in ISO8583 (field length)
Transaction Reference (18)
Beneficiary Customer Account (34)
Originating Credit Institution (11)
Originating Customer Account (34)
Charging Information (204)
E2E Ref (31)
File I.D. (32)
Beneficiary Credit Institution (11)
Originating Customer Account Name (40)
Originating Customer Account Address (140)
Beneficiary Customer Account Name (40)
Beneficiary Customer Account Address (140)
Remittance Information (140)
Payment Return Code (8)
Returned Payment - Faster Payments I.D. (42)
National Westminster Bank Plc. Registered in England No 929027. Registered Office: 135 Bishopsgate, London EC2M 3UR. 90079501