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I installed the prepackaged Authorize.net module, and configured it, yet it did not show up as a payment option when I proceded to checkout. I started searching the forums to find a solution (I found none) and realized that I really wanted the Authorize.net AIM contribution. I downloaded, installed, and configured it, and once again, it doesn't show up as a payment option. I have an Authorize.net account. I aquired a transaction key. The only thing I was hazy about was whether I should be logging in with my Authorize.net username or my API login that came with my transaction key, but I tried both and still nothing. Is there something really obvious that I'm missing? Do I have to activate something through Authorize.net, beyond aquiring an account and an API login/transaction key? Any help would be appreciated.

Please, can I get any help on this issue? I would be grateful.

I been looking for an answer for this one as well. I hope by replying on this post will attract somebody's attention.

Special thanks to Dana for all the information that you shared.

For those who still wondering why AIM seems to be not working and it does'nt appear in your check out payment module is because it is in the test mode from your OS admin. Leave your a.net in test mode and OS admin live. Make sure all information is correct such as log in and trans key.
by just doing this you will see the A.net payment method on your payment method.

with the OS ver listed above you do not need to download anything form contribution except addons. just simply install it from AS admin & payment mudule and follow the above suggestion.

This information was really simple but I wasted few days looking for an answer why there was no a.net payment method on my Site.