|Index||-||FAQ - Cart Help Buttons - Cart Settings - 8. Advanced Settings|
Normally order numbers are sequential, beginning with 1, 2, 3, 4 etc.
The shopping cart cannot hide the invoice number completely from your customer. They are needed for tracking and support. However, we can mask the number so that your customers will not see a small invoice number, and so that they will not see sequential order numbers.
Check this box to encrypt the order number.