title: Can PayPal REST API payments calculate shipping and taxes?
body: <p>I have successfully used the PayPal REST API's to create and execute a payment in the sandbox, but even though I have shipping options and tax rates configured, they do not show up for the user. I expected the shipping options and calculated tax to appear before the user "approves" the payment. Is this feature supported via the REST API's, and if so what do I need to pass to make it happen?</p>