Process ACH Notifications of Change (NOC/COR entries, C-codes) to update stored account data before re-originating

Steps

1. Receive NOC entries from your RDFI or bank partner; NOC entries arrive in a COR-class ACH file and contain the original trace number and the corrected data in the addenda record
2. Parse the change code (C01 through C09) to determine what data changed: C01 indicates incorrect account number, C02 incorrect routing number, C03 both routing and account numbers, C05 incorrect transaction code, C06 routing/account/transaction code all changed
3. Update your stored payment method record with the corrected values from the addenda immediately; NACHA rules require you to make the correction within 6 banking days of receipt or before the next debit, whichever comes first
4. Log the NOC event against the customer record and, if the change is material (e.g., new account number), consider re-verifying account ownership before re-originating
5. Do not originate using the old account data after receiving an NOC; re-originate only with the corrected values provided in the NOC addenda