In our scenario, we will use PayPal Express Checkout for Payflow Pro (important as it's different from PayPal Express Checkout).
Based on documentation, https://www.paypalobjects.com/webstatic/en_US/developer/docs/pdf/pfp_expresscheckout_pp.pdf, we have to provide shipping and tax values prior to knowing customer's Shipping Address.
I think it's not practical at all, so my question - Is it possible to Update (SetExpressCheckout with existing token) shipping/tax amount after address is chosen? Or somehow update (aka Instant Updates) shipping/tax values on PayPal pages?
Also if customer will go back to shopping cart page and add/remove products should customer go back to Paypal pages or we can only update Item Information and DoExpressCheckout with new amount?
Thanks, Stas