Buy now, pay later is (BNPL) is a credit payment service that allows you to purchase goods and pay later in 4-6 installments. Usually, the credit is interest free for buyers if the installments paid on time and full. Shoppers can purchase the goods they need today and pay it back within 2 months. Afterpay, Zip, Quadpay, Paypal and Sezzle are the most popular BNPL services.