the response back from authorize.net is:
["WAAuthNet"]=> string(265) "3::2::13::The merchant login ID or password is invalid or the account is inactive.::::P::0::::::11.24::::auth_capture::::::::::::::::::::::::::::::::::::::::::::::::::::***************::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::"
it is saying the The merchant login ID or password is invalid or the account is inactive. if you are sure you have the correct info entered, contact authorize.net to determine why it is being rejected.