When creating a payment with the Payments REST API, if you do not pass a shipping address, it is possible for the customer to update their shipping address in the paypal pop-up window before completing their payment. If they do this, how can I execute a callback to my server to update the amount in taxes that they should be charged based on their updated shipping address? Ideally, they complete their purchase in the pop-up window without having to be redirected to a review page on my site.
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