This is only applicable to Paddle Classic
Sometimes, a customer is about to purchase a product where it may make sense to offer an upgraded or premium version of the chosen product (upsell), or an additional, complementary product (cross-sell).
This is made easy with the flexible Paddle checkout via Paddle.js’ Upsell property as detailed here.
An example of how this looks in action can be found here.
Please note that this feature is only available and displayed to desktop users.