Is it possible to add a Custome payment section to the site I am building, I have just found out as well as the customer paying by paypal or sage pay or on invoice we need to allow the customers a way to pay there invoices off through the site.

So my question is can I set some thing up in the store that would allow me to enter the following:

Invoice No / PO Number
Case Amount
Payment method.

Bypass shipping and all other cart functions and go strata to pay!