Implement the Pay Now Experience
Important: PayPal supports these Checkout integrations:
checkout.js. Valid before February 2019. Customers who use
checkout.jscan access reference and support material in this integration guide. However, PayPal does not update this integration with new features and enhancements.
Simplify checkout by using the Pay Now button. Use the button if payment is completed on the PayPal review page, as for digitally delivered items without shipping costs.
Use the Continue button if payment is completed on your site to include shipping, tax, and other additional items before submitting the order.
Use the Pay Now experience when possible.
Otherwise, use the Continue experience.