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If you are using the API for incoming sales orders/customers, then the sales orders Sales Orders which are loaded will have details in this tab.
It is only visible when the order is marked as API.
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The aim of this page is to display the incoming information from the website and what we have worked out on the order placed.
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It is quite common that web developers are unable to work out VAT correctly, so it is not uncommon for there to be small amounts of differences. This shows what the API received from the external source.