The 33c is for the transaction attempt and will be charged every time we attempt to process the transaction. The 1.70% for Visa/MasterCard or 3.85% for American Express will only be charged if the transaction is successful.
The 33c transaction fee, as well as the merchant fees (1,7% and 3.85%), will be deducted from the minimum monthly fee of $16.50 irrespective of whether your business or your customers pay it.