Hey Augie-
The lady at the bank is probably talking about a VIRTUAL TERMINAL. This means that your current merchant account probably works with a specific virtual terminal.
MonsterCommerce supports:
Authorize.net
Verisign Pay Flow Pro
Linkpoint API
Linkpoint HTML
If she is not recommending one of these, you are correct that you will need MonsterCommerce to integrate the new gateway for you. I don't recommend this becuase it will be fairly expensive. Due to the security and testing necessary, integrating a new gateway will cost approx $400-$700 (depending on the complexity). You can get this done through our Custom Programming Department.
You will need to be able to tell us the name of the virtual terminal and we will then take about 72 hours to provide you with a complete quote.
Please keep in mind that MonsterCommerce's merchant account does not carry a setup fee so you may find that it is cheaper to go with that account.
Please post again if you have more questions.