This article is will provide instructions on how to perform 2-click upsells with PayPal. This would only be used in the scenario that a PayPal rep cannot enable the Reference Transactions option inside of your PayPal account.
...
Follow the PayPal Seamless Checkout (
...
Legacy) instructions through Step 6. Instead of continuing with Step 7 on that article, follow the below instructions:
Upsell Pages
Step 7: Import Click - https://api.konnektive.com/landers/clicks/import/?
...