Should I record merchant account charges and fees under "merchant account fees...cost of goods sold" or should I record them under "bank service charges"?

For most businesses, they are considered bank fees, which is an expense.  At least that has been the case with the businesses I have worked with over the years.  Here is a good discussion among CPA's on where they should be accounted for:  https://www.proformative.com/questions/accounting-for-merchant-fees