Authorize.net test

Does anyone have any experience with authorize.net? I have a test account with authorize.net and I have written a script to use the checkout of authorize.net but I keep getting this error: 3|2|13|The merchant login ID or password is invalid or the account is inactive.||P|0|||45.99||auth_capture|||||||||||||||||||||||||| C6625114C7C848C859D5D0C446C1F7CE|||||||||||||||||||||||||||||| and this error: 3|2|13|The merchant login ID or password is invalid or the account is inactive.||P|0|||0.00||auth_capture|||||||||||||||||||||||||| F68A9C87C1E1472521704EF38C21F647|||||||||||||||||||||||||||||| I have checked and rechecked my login ID and password with no results. The code is spread across 3 files config.php, authorize_net_request.php, and test_authorize_net.php and I have posted these files to pastebin because I didn't know if I could post the code here. Could someone give these files a look over and see what I've done wrong? The pastebin URL is: http://pastebin.com/5xacghDR Thanks so much. -- Blessings David M. I have been driven to my knees many times by the overwhelming conviction that I had nowhere else to go.