os_authnet payment failure since 3.0 upgrade

Cheers- Ever since 3.0 was released my
"os_authnet" payment method stopped working. Please know, everything was working and configured correctly prior to May. Nothing has changed. Eshop was updated and I have not been able to receive credit card payments since. The error that shows is "Payment failure
The merchant login ID or password is invalid or the account is inactive."

Is there any code I can double check in the php files? What do you think might have happened? I have not seen posts from others that lost payment ability so apparently not a common problem. Again, my bank info, all my info hasn't changed. Just one day it stopped working and that day was pretty near the 3.0 upgrade.

I am on 3.0.2.

Thanks!

Hello Ryan Cook,

The update of EShop does not have anything related to the Authorize.net payment plugin. As the message that you showed, I think that's the problem with your account. Can you please check to make sure that your account is still activated?

Sincerely, Giang