For shipments leaving the customs territory of the EU, you need customs documents, which must be kept properly.
Customs documents are all types of documents and forms required for entry, import, transit and export to and from one or more countries at the time of presentation. In order to take advantage of tax benefits, customs documents must be presented in addition to customs clearance.
The multitude of different documents is often confusing, especially for newcomers to international business.
The brochure covers the basics and answers your questions about imports for Internet orders.