Complex sentence: Contactless runs over the same chip and PIN network as normal credit and debit card transactions, there is a payment limit on single transactions and some contactless cards can only be used a certain number of times before customers are asked for their PIN.
Split into simpler sentences: Contactless runs over the same chip and PIN network as normal credit and debit card transactions. There is a payment limit on single transactions, and some contactless cards can only be used a certain number of times before customers are asked for their PIN.