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How do you test invalid/unauthorized transactions using the Sandbox?

I'm using the test credit card numbers supplied by Authorize.Net in test mode to my application. I want to test an unauthorized transaction so I can check various the response reason codes, but I can't get it to fail using the bogus credit card numbers. How do I get it to fail or is the only way using a real credit card number, which I don't know that I should do?

JeffSGA007
Member
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RaynorC1emen7
Expert