Faster Payments enablement guide - NatWest

Faster Payments options
As a result of enabling your sort code for Faster Payments, there will be some changes to your data files and
settlement transactions for the Datalink CAS service. The changes will depend on which option you select to
receive the Faster Payments information.
The options and changes are summarised below and each option is expanded in the following pages.
Option 1: A merged CAS file
You may find this easier as it does not require you to receive an additional file. Faster Payments transactions
would be stored at NatWest as they are received, then merged into your existing CAS file so that you have one
file to process in the same way that you do today. You will receive the benefit of the funds in near real-time,
and if you process your CAS file overnight, your customer accounts/records will be updated earlier.
Option 2: Separate Faster Payments file(s)
Faster Payments received at NatWest will be batched periodically during the day and made available to you
in Faster Payments files throughout the day. You have the option to receive between one and five files at
various times.
You can receive the information in the same file layout as your CAS file or a new ISO8583 format is also available.
This option is likely to present the most changes to your processes. The benefit is having the ability to receive files
intra-day in order to update your customer accounts/records in the earliest possible timescales.
We have provided some more information in Appendix B and a full file format is included in your pack.
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