Use these settings if you want to review orders before processing the credit card.

Uncheck the 'an_review' field if students will be enrolled to courses immediately when they entered their card number.
If you have checked 'an_review' field, the credit card will be authorized but not be captured and you will have 2 options: 'Manual-Capture' and 'Scheduled-Capture'.

• For Manual-Capture, enter '0' to an_capture_day field. Transaction will be cancelled unless you review it within 30 days. Don't panic! Your business is important for us. In 'Email Sending Settings' section, you will be notified X days prior to pending orders expiring if you set up the CRON properly.
• For Scheduled-Capture, enter a number between 1 and 29 to an_capture_day field. Note that CRON MUST BE ENABLED. The card will be captured and the student will be enrolled to course. The scheduled-capture system captures the card an_capture_day days later if you like your own convenience. If you are a sceptic person, you may accept or deny the payment after you have received email about new pending order. Users can also be mailed for welcome message if you check enrol_mailstudents.

In Moodle 1.6, you can accept/deny/refund the payments in Payment Managament page.