The confirmation may be a copy of the customer's opt-in, if it includes a statement advising the customer of the right to revoke the customer's consent at any time (and how to do that). It could also be a separate form or letter if it describes what the customer has done (opted into the overdraft service for ATM and one-time debit card transactions) and advise of the revocation right.
You do not need the customer's acknowledgment of receipt of the confirmation. The tennis ball will have already crossed the net enough times. You can assess an overdraft fee for a covered transaction anytime after you've sent the confirmation, whether or not it actually reaches the customer.
_________________________
John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8