Thanks much for pointing out this critical point! Where can I read find the up-to-date technical documentations on different transactions and associated available methods or APIs? I searched for "paypal website payments standard transactions" but could not find a web page that explains it with sufficient technical details. Thanks for the link on how to update the paypal smart button to include tax! Again, where can I read more technical details about this so that I know all the relevant and available methods, such as shipping cost, etc.? All I can find is a legacy doc that contains high-level (vs. technical) descriptions of such features https://developer.paypal.com/docs/paypal-payments-standard/integration-guide/ProfileAndTools/#calculate-sales-tax-automatically Up-to-date documentation with sufficient technical details (APIs) would be greatly appreciated!
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