1-Click upsell functionality is automatically integrated into your sales funnel. However, there are a few prerequisites to ensure true 1-click upsell functionality is in place.
Make sure you connect the appropriate Payment Gateway under Campaign settings.
1-click upsell features work with all payment gateways PayKickstart integrates with.
Ensure that you link your Buy Button on each sales page with the correct link found in the Funnel section.
Once your customer makes the main purchase in the sales funnel, they will be able to use the 1-click feature to purchase the additional upsells in your sales funnel.
In order to allow 1-click upsell purchases to work correctly, the upsell product must be using the same payment gateway as the main product purchase.
Since the upsell purchases will be 1-click, you will need to use the checkout page link on the upsell landing page. Embed and pop-up forms will be disabled for upsell products using the 1-click upsell purchase option.