Bluefin Account Adjustment
Bluefin Account Adjustment
2026-04-01T14:11:00.0000000Z
2026-04-01T14:11:00.0000000Z
CUSI has been made aware of a processor-level MasterCard Interchange adjustment that may have impacted your Bluefin merchant account. Fiserv has issued credits to a subset of clients. If you notice a small deposit/adjustment on your bank account on 3/27/26, it is related to this Interchange adjustment.
Please see below notification from Fiserv:
Overview: Mastercard has identified an internal issue that caused a subset of clients and merchants to be assessed improper interchange rates for specific Mastercard Interchange Programs from January 2024 through March 2025.
Be Informed: Mastercard has identified the transactions that had incorrect interchange rates applied and performed an interchange rebalance to pass the adjusted interchange cost differences. As a result, Fiserv will complete adjustments as outlined below:
•The Credit/Debit as applicable, will be processed by March 2026 Monthend.
•The memo on the account will indicate “MC Interchange Rebalance”.
Any questions can be directed to our technical support staff at techsupport@cusi.com.
2026-04-06T15:50:00.0000000Z
2026-04-06T15:50:00.0000000Z
Resolved – MasterCard Interchange Adjustment (Bluefin Accounts)
This issue has been resolved.
CUSI was made aware of a processor-level MasterCard Interchange adjustment that may have impacted your Bluefin merchant account. Fiserv has issued credits to all applicable clients.
If you noticed a small deposit or adjustment on your bank account around 3/27/26, it is related to this Interchange adjustment. The memo on the account will indicate "MC Interchange Rebalance".
Background: MasterCard identified an internal issue that caused a subset of clients and merchants to be assessed improper interchange rates for specific MasterCard Interchange Programs from January 2024 through March 2025. MasterCard identified the affected transactions and performed an interchange rebalance to correct the cost differences. Fiserv completed the applicable Credit/Debit adjustments by March 2026 month-end.
No action is required on your part.
If you have any questions, please contact our technical support team at techsupport@cusi.com.