When you turn on the PayPal Integration feature but choose not to check the Use Express Checkout box, customers can still choose PayPal as a payment option during checkout. When customers choose PayPal, they click a Pay With PayPal button at the end of checkout in your site. When customers use this method, customer payments are deposited in your PayPal merchant account.
Note that if Express Checkout is not enabled, then transactions processed using the PayPal payment option cannot be refunded from within NetSuite. You must log in to the PayPal website separately.