Bill Management & External Customers Paying by ACH

Summary: Process Question on Bill Management and Pay by ACH

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We are implementing Bill Management in Fusion and need some clarification on how the process is supposed to work for Pay by ACH when an external user/ customer initiates the payment via Bill Management? After the external user chooses to pay by ACH, does Bill Management create an automatic receipt in Receivables with then a file getting sent to the Bank to pull the money from the customer's bank account similar to what is done when direct debit from the customer account is done or is the process different? Thank you