In Singapore, you will need to pay tolls and parking by inserting a NETS Cashcard into the IU (In-vehicle Unit) in your motorbike before you ride.
You can buy a cashcard from any convenience store (7-Eleven, gas station, etc).
The Electronic Road Pricing (ERP) is an electronic road toll system in Singapore. When your motorbike pass through a ERP gantry, a toll is automatically deducted from your cashcard without stopping or slowing down. Toll value varies from $0 to $2.5 for motorbikes for each ERP passing through.
Parking works the same way. The gantry reads cashcard remotely through IU. Parking rate varies from $0.65 to $4.0 per day.