When will the up-sell be made?
The up-sell is made before the payment, since it is not possible to offer an additional product after completing the order.
Can I have multiple up-sells?
You can show different offers on the checkout page.
Can I add a specific product variation in the condition?
Yes, of course you can, the plugin supports product variations both in the rule conditions and in the product offered with discounts.
So, for example, you might offer the product Cap – size LARGE for free only on the product T-shirt – size LARGE.
