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I've been looking through the information that's available but I don't see how one can update a transaction that already been submitted and approved. I need to update the invoice number field after I get the approval back from the transaction. How ca...

I've got the following: IGateway OpenGateway() { //we used the form builder so we can now just load it up //using the form reader var login = ConfigurationManager.AppSettings["ApiLogin"]; var transactionKey = ConfigurationManager.AppSettings["Tran...