For each integration system to work, specific settings are needed as well as some additional modules. You can read how to add an integration system here. To set up the systems already added, follow the links with the systems of the same name – for example, if you want to find out how to set up WooComerce, read the page called WooComerce.
For all sites based on Cloudcart, Magento, Opencart, WooCommerce, Seliton, prices must be configured in advance to include VAT.