Some configuration to your account must be done at
Authorize.Net's Web site (Authorize.Net will have supplied you with
access details). This is referred to as Authorize.Net's
Merchant Management System. Login
at:
Go
to 'Settings and Profile', under 'Security', select 'obtain
transaction key'. Enter your secret answer to obtain your key. This
key must be entered in the TransactionKey setting (see @17.4.1. Setup within Kartris).
