This section only applies if you have credit card processing enabled, so that the credit card transactions are processed through Campground Master. Otherwise, credit card payment transactions can simply be deleted like any other transactions (and with the same restrictions depending on your access level).
If you do have credit card processing enabled (and the setup indicates that Voids are possible through your processing software), then removing credit card transactions requires that the transaction be Voided before it's settled with your merchant processor. After a credit card payment (or refund) has been processed and approved, it usually cannot be deleted without the Void procedure. To do this, you simply highlight that payment or refund on the Transactions dialog -- the button that's normally "Deleted Selected Item(s)" will change to "Void Selected CC Item", so click this button. A Void dialog will open with the credit card information, and you can submit the void transaction for processing.
Note that you might not be allowed to Void a transaction, or may only be allowed to Void it before the Transactions are Saved, depending on your operator access level.
The Void process is similar to processing payments -- it requests the void from the processing software, and shows a response. It can also be aborted if necessary.
If you've enabled the option to automatically print credit card slips, then a "VOID" slip will be printed when it's processed. However there's no way to print one manually, since the transaction is deleted from the system after the Void is processed.
There may be an additional option on the Void dialog to delete the transaction without processing the Void. This is restricted depending on your operator access level (see Maintenance / Park Setup / Access Levels), and should only be used in situations where you must delete the transaction from Campground Master but cannot get the Void processed automatically. If the Void cannot be processed for legitimate reasons (e.g. the batch has already been settled), then you should cancel the Void process and enter a Refund transaction instead.