With WHMCS all orders are pending until accepted. Orders can reviewed by navigating to Orders > List All Orders. The items in that order - hosting accounts and domains - will be automatically activated based on the product auto setup options and domain auto registration options.

So if you have hosting and domains configured to be provisioned and registered instantly upon payment, that will be done while the order remains pending. This allows the automation to take place whilst providing a method to manually review each order received, giving you an opportunity to keep track of new orders received and run any manual checks your business practices require.

For more information please refer to our documentation on Order Management.