For shipments outside the EU, you need to compile customs documents. The Customs requires a photocopy of the ID card of the sender, the proforma invoice and also the declaration of free export.
In the Declaration of Free Export you need to enter name and surname of the sender, the full address, the place, date and sign in the end. The document needs to be made before the transit of goods by national customs. It is possible to send it electronically, directly from the company that has to export the goods.