What is PayPal pay later, choose PayPal at checkout and select 'Pay Later'- You'll see 'Pay in 4' as a way to pay. Get a decision in seconds and complete your purchase. Make the down payment today, and pay the rest in 3 payments – one every two weeks. To enable PayPal Pay Later messaging, you must make a few minor changes to your existing PayPal setup. Full integration instructions are available in our developer docs.