Bart,
Yes, I completely understand what you are saying. What I was suggesting was that there might be a way to get a transaction ID before submitting the customer's credit card information. If you use the WebLink method, the gateway server generates a transaction ID for the customer form (ie before the credit card info is transferred). That is the reason I think we might be able to get a transaction ID from the ADC direct response method. If we can get the transaction ID before the sending the credit card info, you can easily map the ecommerce package's order ID to the unprocessed transaction code/ID from the gateway server before sending the credit card data. If you don't get a response from the gateway server, you can always requery it.
I'll call Authorize.net later today to get more information.
