When arrived at airport in Singapore, was told by check-in counter staff that "there was a problem with my ticket payment" and that I had to see the ticketing counter. Went to the ticketing counter and was told that my payment did not go through. Showed them the printout of the confirmed ticket, but was told that I still have to pay for the ticket again as they are not Cebu Pacific airline staff, but are in fact Singapore airport terminal services staff. No choice, and since no cash, had to withdraw cash advance using credit card from airport ATM to pay for the ticket. Same ticketing staff, when questioned, said that they get at least 20 such cases each day regarding "problem with ticket payment" for Cebu Pacific Airlines bookings.