WooCommerce one-click upsells or post-purchase upsells are upsells after the checkout.

Once a customer enters their payment details and clicks ‘place order’ on the checkout page, you show them relevant upsell offers related to their recent purchase.
In this post, I’ll show you how you can use WooCommerce one-click upsells to boost your average order value.

I’ll be using UpStroke one-click upsells to do that.