When you offer an upsell to your customers do they have to put in their payment information again? Or is there a service that allows them to do a one click upsell that remembers their information and just charges them the additional price and gives them both products.
How do you set up your upsells? Do you offer the upsell before payment or after? What service do you use to deliver your products that also offers an easy to use upsell option?