At the far left, after exiting arrival hall Damri have set up a counter.
(Dont see this during my first airport explore trip years ago.)

Airport bus hv 2 routes,both priced at Rp22k
Jodoh : bus stop in front of BCA
Batu Aji : bus stop Opposite Hypermart Tanjung Uncang
Ask about the schedule time, the counter guy show me the ticket

And ask me to call.