API wise, cards have sides just like rollable tokens or dice images (which I suppose are rollable tokens really). Side 0 is the face of the card, Side 1 is the back of the card. Choosing the Flip Card option switches which side is set. Side can be set by the API. HOWEVER: Side changes made by the API do not cause an update to the current imgsrc! I started a thread of API bugs and such that it would be nice to see fixed in the API pass that Riley mentioned he was going soon and listed that one among it. If that gets fixed, it would be trivial to write a script that flipped cards. It would only be a question of the interface at that point.