See this link for more information: https://www.paypal.com/us/webapps/mpp/account-optional
Once you have logged into www.PayPal.com ►
[To turn the feature off, simply go to the Profile subtab, click on Website Payment Preferences under the Selling Preferences column, and check the yes/no box under PayPal Account Optional.
*This feature is available to Premier and Business account holders only.]