Answer:
Visa transactions are flagged as such on your network reports, and they typically result in authorization holds followed after the fact by the actual transaction. It does not sound like you are looking at Visa transactions, so you are left with the Reg. E $50 rule.
Your assumption about the relationship between the Visa and Regulation E liability provisions is correct. When both apply, the one more favorable to the consumer controls.
First published on BankersOnline.com 3/23/09