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A comment on Introducing PayPal’s open-source cross-domain JavaScript suite. Parent comment

Re:Introducing PayPal’s open-source cross-domain JavaScript ... by icebraining on Monday October 16, 2017 @10:12AM (#15483296)
For many people this can work, however, the minute you have to do anything on the server side such as calculating shipping costs or an address validation (using a service that costs real money) this cannot work.

Why? Can't you push the results back to your server when you get them?

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Re:Introducing PayPal’s open-source cross-domain JavaScript ... by jameskegel on Monday October 16, 2017 @10:42AM (#15483498)
I'm somewhat out of my wheelhouse on this topic, but one thing that came to mind was "can we trust the results of this calculation if it is done on the client computer?". Tampering could be problematic.
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