I updated from 4.6 to 4.7.7 yesterday and if a guest user comes to our site to register they receive the following errors:
Notice: Undefined index: user_name in CRM_Core_Payment_AuthorizeNet->__construct() (line 55 of .../civicrm/CRM/Core/Payment/AuthorizeNet.php). Notice: Undefined index: password in CRM_Core_Payment_AuthorizeNet->__construct() (line 56 of .../civicrm/CRM/Core/Payment/AuthorizeNet.php).
However, if I am logged in to my drupal site, I do not receive these errors. Any idea why this is happening? I went into the Admin > System > Payment Processors and there's no place for user_name or password. I'm guessing they are looking for a drupal username; however we do not require login to register or donate using civi.
We are using Civi 4.7.7 on Drupal 7.x (can't remember which version).