It is indispensable in contemporary customs practice, direct (and indirect) representation. You sign a proxy and the customs agent handles the declarations in your name and for your account. The representation also regularly causes legal problems. Especially the power of attorney is often the source of issues. Is it correctly prepared and / or issued? Is there representation by the authorized (legal) person? Customs authorities are still very formal here. Make sure you also have your affairs in order in this area and you can rightly say that you are in-control.