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Octopus is the universal electronic toll collection system in Hong Kong.
The chip is built into a plastic card the size of a credit card, which is recharged and placed on a receiver to complete the payment process. Octopus can be recharged at top-up machines, store payment counters, credit cards, bank account autopay, etc.
Octopus is a contactless smart card that is very convenient to use in electronic money. Whether trading or top-up, the operation is very simple.