Thank you for a fantastic plugin. I'm running on a test site and it is working under WP v3.5
A few suggestions for the next release (unless I am able to make these corrections on my own).
1) Duplicate email messages: The system is sending the "Secure Card Asked" and the "Secure Card Ready" twice. One has to be careful as it is the codes in the second email attachment that work for the user.
2) Email Content: As an administrator, I need to be able to edit the email subject as well as the message generated by the system with more detailed instructions for users.
3) Login Screen: I appreciate your desire to promote the plugin. However, if user needs help I need to direct them to my own custom URL (if not an email form) rather than to your web site. It would also be nice to remove the "powered by" link as it may be giving a potential hacker ideas.
Many thanks -