Hi,
I recently came across an e-commerce site that uses Paypal to do upselling. The checkout flow is roughly as such:
Customer adds product to cart --> checkout --> key in shipping details into paypal --> pay --> page redirects to an upsell page --> customer clicks "Purchase" --> transaction complete
The user does not need to key in any shipping details or login to paypal or anything, and the payment goes through straightaway.
I am interested to duplicate this flow on my own store, and I am wondering if someone could point me to the documentation that allows me to build this flow.
