I set it up for a look yesterday, and as per JCook it is only available in Enhanced (it does also say this in the doco).
After you get it installed the other thing that is not really documented well is that it is expecting to be an edit/readonly step with the Amount field already populated populated e.g. first step insert with amount, second step edit/readonly with amount field displayed (it will preview in the editor on an Insert but not render on the actual site),
