Walmart Buy Now Pay Later | Payment Options PayPal Pay in 4 Walmart. Like the name suggests, Paypal's new BNPL solution offers a 4-installment plan to finance whatever you'd like to buy from Walmart. You can simply select Paypal as your preferred payment option on checkout. Once the Walmart website redirects you to Paypal's portal, you'll get the option to choose Paypal Pay in 4.