Authorize.net Recurring Billing Resolution Script ProcessAuthorizeReport.php does not decode base64 attachments

Authorize.net Recurring Billing Resolution Script ProcessAuthorizeReport.php does not decode base64 attachments.

The e-mails I received from Authorize.net for ARB resolution were not being processed by the ProcessAuthorizeReport.php script due to the script not decoding the BASE64 attachments.

Changing:
$attachments[$file_name] = $body;
To:
$attachments[$file_name] = base64_decode($body);

Fixed the problem for me. Though a more robust solution for handling the attachments is needed.