Candace Payne, best known as "Chewbacca Mom" -- the woman who went record-breakingly viral -- is going into overtime on her 15 minutes, and making good money doing it.
Chewy lovers at Dallas' Fan Expo forked over $20 for a photo and autograph from Candace during her first convention appearance Sunday.
Payne got a prime booth spot too ... right next to Jack Gleeson from "Game of Thrones." We're told her line was "average" compared to other celebs -- with a wait time of about 10 minutes.
Predictably, some Internet haters turned on Candace ... calling her gig "greedy." But it's worth noting, the convention says a portion of the proceeds will be donated to a Texas church.