Your bank, sb1, is obligated to stick to the terms of the MasterCard and/or Visa as regards cash advances over the counter, and your ATM network agreements regarding cash withdrawals at your ATMs.
It's likely that you will not be permitted to impose a fee for handling the OTC cash advances, because the network agreement provides for your payment via interchange fees. On the ATM withdrawal side, you can impose whatever your existing "surcharge" is for withdrawals with cards you don't issue.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8