Hi I am beginning an integration using the REST API as I need full control over the process. I assumed that I'd be coding everything server side, so I cannot see how I should be adding the Paypal button which essentially should just call my own code which will set up the order via the API and redirect to the Paypal URL? Also I won't know the shipping value until I have the delivery address - can I go from my site, to Paypal, back to my site to display the shipping and then confirm the order after that? I have been trying to find some documentation on checkout flow but can't seem to find anything that explains it. Many Thanks
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