I looked on https://developer.authorize.net/hello_world/testing_guide.html and can trigger error code 2 with just the zip code, but there isn't anything for most of the other error codes...i.e code 3....

I am using the hosted form payment approach to accepting payments from users on my site. I dont see any examples of how to go about verifying the payment once the user is redirected back to my site. H...