For all products, either normal VAT applies, or zero VAT if the customer is VAT registered; I think we can use the European VAT mod for this.
In orders where installation of the products is also requested, we can edit the shopping cart (login as the customer, or by accessing the db directly) and add the cost of installation.
So far so good...
BUT, for those orders which include installation, we need to charge the normal zero rate for VAT registered customers, or a reduced 5% for those that aren't.
Has anyone any idea how to achieve this, before it gets to the checkout?
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