Editing ACH Network (section)

==Types of ACH transactions==
ACH is the only major payment system in the United States that features both "push" (or ACH credit) and "pull" (or ACH debit) transactions.<ref name="piu"/>

===ACH debit transaction===
The payee's sending institution creates, batches, and transmits an ACH debit transaction to the payor's receiving institution. The ACH debit transaction instructs the receiving institution to withdraw and transmit the funds from the payor's bank account to the sending institution.
 
The receiving institution must send the return to the sending institution by the end of the following business day if it is unable to debit the funds from the payor's account, such if the account was not found, the account was closed, or the account was frozen.
 
For an ACH debit transaction, the sending institution may be a third-party bank, rather than the payee's bank.

===ACH credit transaction===
The payor's sending institution creates, batches, and transmits an ACH credit to the payee's receiving institution. The ACH credit transaction instructs the receiving institution to credit the funds to the payee's bank account.
 
The receiving institution must send the return to the sending institution by the end of the following business day if it is unable to credit the funds to the payee's account, such if the account was not found, the account was closed, or the account was frozen.

For an ACH credit, the sending institution may not be a third-party bank, rather than the payor's bank.