An online shop has the obligation to reveal information about its company and about important aspects of the sales contract.  The information must be easily accessible and not behind a large number of mouse clicks that hides the information.  In particular, the information about the identity of the online shop must be accessible (the imprint), its full name, its legal representative(s) and the legal valid address (§ 1 BGB InfoV).  If this information is missing or you have difficulties finding this data you are better to leave the shop, since the online shop seems to hide something or does not act professionally according to the principles of the online market.