- ACH (Automated Clearing House)
- A US electronic funds-transfer network operated under NACHA rules that processes direct deposits and direct debits between bank accounts.
- NACHA
- The governing body that sets the rules for ACH transactions in the United States, including required authorization language, return codes, and record-keeping obligations.
- Pre-Authorized Debit (PAD)
- The Canadian equivalent of an ACH debit, governed by Payments Canada Rule H1, which requires written authorization and specific revocation notice periods.
- SEPA Direct Debit
- A euro-denominated direct debit scheme operated by the European Payments Council, covering 36 countries, that requires a signed mandate before any draw can be initiated.
- Direct Debit Guarantee
- A UK consumer protection rule requiring banks to refund any unauthorized or incorrect direct debit immediately upon request, with no questions asked.
- Originating Depository Financial Institution (ODFI)
- The bank or payment processor that initiates an ACH debit entry on behalf of the payee — it bears responsibility for ensuring a valid authorization exists.
- Return Code
- A standardized code issued by the receiving bank when an ACH debit cannot be processed — for example, R01 (insufficient funds) or R10 (customer advises not authorized).
- Pre-Notification (Pre-Note)
- A zero-dollar test entry sent to the receiving bank before the first live ACH debit to verify that the account and routing numbers are valid.
- Revocation
- The account holder's right to cancel a debit authorization, typically requiring written notice to the payee at least 3 business days before the next scheduled draw under NACHA rules.
- Mandate Reference Number
- A unique identifier assigned to a SEPA Direct Debit mandate by the creditor, required on every transaction initiated under that mandate.
- Net Settlement
- The process by which a bank aggregates ACH credits and debits across a business day and settles the net position rather than processing each item individually.