If you work with Authorize.Net, you will set up your merchant account here.

Your Authorize.Net account information must be entered on this page before you can run transactions through Agemni. Enter a name for your account in the first blank feild assocaited with the account that you have set up with Authorize.Net. Use your API Login ID and Transaction Key as the username and password (They can be found in Authorize.Net under Settings). Enter in your email address and press the Add button to save your information. When your merchant account is set up, you will be able to make charges in Agemni through Authorize.net.

If you run into any problems processing an account, confirm that your API login and Transaction Key are valid and have been activated through Authorize.Net. We generate error messages right from their site directly, so if you are getting a red error message while trying to process credit card then it means that you are missing a link somewhere in the Authorize.Net site.
If you have any problems setting up your account with Authorize.Net please contact them at 1.866.437.0476.