If you are not receiving your sales notifications make sure to check your spam folder.
Sales notifications will come from JVZoo and will be sent to your PayPal email address. The email address you use for PayPal may be different from your primary email address so verify you are checking the right inbox.
Another way of verifying a sale is made is by checking your seller stats report:
You can also check the detailed stats of an individual product on the sellers dashboard: