If you go to Admin->Modules->Payment, click on Authorize.net AIM, write down all your settings, then click Remove, then click Install, and re-enter all your settings ... do you now have the MD5Hash option showing?
If you go to Admin->Modules->Payment, click on Authorize.net AIM, write down all your settings, then click Remove, then click Install, and re-enter all your settings ... do you now have the MD5Hash option showing?
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