Add a PayPal Express Checkout Option to Your Cart. Hate worrying about SSL certificates and PCI compliance? We hear you. PayPal Express can handle all of the security for your store’s checkout process for you by allowing checkout to happen on PayPal’s secure servers instead of on your website. Not only do you gain customers’ trust by associating with and accepting PayPal, but you also gain the peace of mind that comes with knowing security is handled for you.