Payment gateway that just creates invoices?

[mddrch]

We already have a way of billing our customers. All of our customers are pre approved. We need a method to sell services and simply create a note for our accounting dept with all the relevant information about products and prices, and they handle sending out invoices once a month. All the payment gateways I have seen work by immediately accepting a transaction, be it paypal, credit card, etc. but none that fits our need. Is there a way to do this? Thanks for any info

Edited Tuesday at 02:15 PM by mddrch