It would be helpful to have a specification in the Payment Methods that would enable/disable a particular payment method based on the dollar value of the order.

So for example, we have a payment method called "Purchase Order" that allows select customers (via groups) to enter their P.O. number rather than completing a credit card or PayPal payment at time of order entry.

But we would like this payment method to be visible to the customer only when the cart exceeds a minimum value (perhaps $300)...for orders less than the minimum they would see only the standard, fallback payment options (like credit card, etc.).

It would also be helpful to specify a maximum value to a Payment Method. For example for some commercial customers, we might like to disable credit card payments over a maximum value (perhaps $2000) and require the customer to use Purchase Order or other terms of payment we have assigned to their account (via groups).

Of course, Admin should be able to override the user visible choices for special circumstances such as customer phone-in orders or admin editted orders.

Thanks!

-Jeff