What does the author mean here when referring to customs when shipping products from within the EU to other EU countries? The EU has a customs union...
The VAT per country can be a bit of a pain but is a solved problem (Shopify, Amazon, can all take care of it easily).
I stopped purchasing from the US as the vat gets collected - has to be in cash - by the delivery drivers.
Now, i just sweep through the EU various countries (not you, UK [I do so enjoy HP sauce...no more]) to get the best deal, and get charged vat up front.
The VAT per country can be a bit of a pain but is a solved problem (Shopify, Amazon, can all take care of it easily).