Goblin Engineer Membership Card

This item is no longer available from patch 3.1.0. The renewal quest have also been removed.

Source
To initially acquire this card, you had to specialize in Goblin Engineering. After that, you could get it renewed by the master goblin engineering trainer.

Trivia
The "Goblin Experimental Engineering Korporation" mentioned on the card shortens to "GEEK". This seems to be intended (compare Gnome Engineer Membership Card).