This is what was told during the last day of my course. How it
works?
You can apply to CDG for
re-course... 
Only applicable to CumFu
k cabs.....
Go into CBD
toll-Gantry (including Orchard Area).
If u can't get a Pax within 15 mins, Coy will refund you.
If you get a IVT call, Pax no show - Coy will refund you.
If you get a IVT call, you
reject - no refund.
You must be on TAXI sign... cannot put
BUSY when
entering Toll-Gantry.
But got refund or not... I also never check
...
(last drove for CDG almost 2yrs ago).