ACK (ACH Payment Acknowledgement)

An ACK entry is an acknowledgement by the receiving depository financial institution (RDFI) confirming the receipt of a corporate credit or debit (CCD) credit entry.

Related Terms

  • Authorizations (Card Processing)

    All transactions must be authorized via terminal, cash register, voice authorization, or automated voice response phone system (IVR).

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  • ODFI (Originating Depository Financial Institution)

    Financial institutions that originate ACH transactions on behalf of its customers. ODFI's must abide by the National Automated Clearing House Association (NACHA) Operating Rules.

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