Pending payment is a fee of toll/parking that was charged on your last GoCar trip.

If you're seeing this page below, it means your cashless balance used on your last trip was insufficient at that time, so you need to settle the previous GoCar pending payment first before going to the next trip. Please also note that you can't pay toll/parking fee with GoPay Coins. 

How do I pay the pending payment then?

You can click here to see how to pay your last GoCar trip pending payment