Proof-of-payment (POP) or proof-of-fare (POF) is an honor-based fare collection system used on many public transportation systems. Instead of checking each passenger as they enter a fare control zone, passengers are required to carry a paper ticket, transit pass, transit smartcard — or open payment methods such as contactless credit or debit cards (if applicable) — after swiping or tapping on smart card readers, to prove that they have paid the valid fare.
Proof-of-payment (POP) or proof-of-fare (POF) is an honor-based fare collection system used on many public transportation systems. Instead of checking each passenger as they enter a fare control zone, passengers are required to carry a paper ticket, transit pass, transit smartcard — or open payment methods such as contactless credit or debit cards (if applicable) — after swiping or tapping on smart card readers, to prove that they have paid the valid fare.
Source: Wikipedia "Proof-of-payment" · CC BY-SA 4.0
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