What you will need for this?

Create an Offer for the product
Create a product.

Follow these steps to add 1-click upsell to a page :

Click on the "Checkout" option from the builder elements.
Select and drag "Upsell" in checkout options to the page.
Double click on the the "Upsell" element.
In general settings, select the Product you want to sell.
Publish or update your page.

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