Dave, Now that (I think) I have all of the information needed and have been able to look over a good sample transaction, my best worst case estimates are: Configuration piece (payconfig.cgi) working by Wednesday, May 1, Authorization piece (thankyou.cgi) working by Tuesday, May 7, Billing piece (orderhandler.cgi) working by Friday, May 10. I already have a test account set up with CSI, so we won't have to wait for that. I have intentionally estimated long on the Authorization piece because it will involve modifying the ssl/xml code we have to handle the private key validation. --Richard -- Richard B. Pyne Software Engineer ShopSite, Inc.