I found a small bug on the refund page for Authorize.net.
In Admin>customers>orders you can edit an order and void a transaction that hasn't settled.
The input box on the right says "enter auth ID" but that didn't work; I got a "transaction not found" error message.
So I tried the transaction ID instead and that worked.
The file is /public_html/includes/modules/payment/authorizenet/authorizenet_admin_notification.php
and line 76 (or 77?) is
Line #76 : $outputVoid .= MODULE_PAYMENT_AUTHORIZENET_AIM_ENTRY_VOID . '<br />' . zen_draw_input_field('voidauthid', 'enter auth ID', 'length="32"');
but should be this to avoid confusion:
Line #76 : $outputVoid .= MODULE_PAYMENT_AUTHORIZENET_AIM_ENTRY_VOID . '<br />' . zen_draw_input_field('voidauthid', 'enter transaction ID', 'length="32"');



