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Excellent point! I was pointing to the wrong server. Once that was fixed, all was well. Thanks for your help!!

Ok, I used the AIM sample code and only changed the reference to login ID and transaction key to reflect actual values. I keep getting the same error... post_response "3|2|13|The merchant login ID or password is invalid or the account is inactive.||P...

Thanks for reaching out. I originally started out with setting up the form data on the client side using some sample code from authorize.net and it worked just fine. I moved all of the data to the server side and that's when I ran into this error. I ...

I am also trying to do a server-side posting of form data. I am using the NameValueCollection and WebClient of C# to make this happen. I seem to be making a connection to secure.authorize.net... but I am getting an error that the merchant login ID or...