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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.
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Acquirer
An acquirer is a bank that processes credit and debit card transactions for a merchant.
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Banking Day
A day on which the development financial institution (DFI) is open to the public and performing a majority of their banking functions, or, in the case of an ACH Operator, a day that the facility is operating.