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  2. Google Wallet - Wikipedia

    en.wikipedia.org/wiki/Google_Wallet

    All these cards are region-locked and cannot be added by foreign tourists. [88] Transit loyalty cards are passes that can be linked to one payment card in a user's Wallet. Similarly to a transit card, it will keep track of rides made on the system and offer fare caps. However, there is no standalone balance.

  3. Paysafecard - Wikipedia

    en.wikipedia.org/wiki/Paysafecard

    [66] myPaysafe also offers gift card purchases – users can use their balance to buy retail and entertainment gift cards from the likes of Amazon, Nintendo or H&M. [67] In several countries, paysafecard also issues a prepaid paysafecard Mastercard .

  4. Visa Debit - Wikipedia

    en.wikipedia.org/wiki/Visa_Debit

    Bendigo Bank issued the first Visa Debit card in 1982, more than two decades before Debit Mastercard, or widespread Visa Debit use in Australia. [1] Today it is in wide issuance, and domestically switches over local networks, though for new banks, connection to Visa is permitted.

  5. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    The check digit is calculated by (()), where s is the sum from step 3. This is the smallest number (possibly zero) that must be added to s {\displaystyle s} to make a multiple of 10. Other valid formulas giving the same value are 9 − ( ( s + 9 ) mod 1 0 ) {\displaystyle 9-((s+9){\bmod {1}}0)} , ( 10 − s ) mod 1 0 {\displaystyle (10-s){\bmod ...

  6. Contactless smart card - Wikipedia

    en.wikipedia.org/wiki/Contactless_smart_card

    Size comparison of chip compared to a Canadian penny. A contactless smart card is characterized as follows: Dimensions are normally credit card size. The ID-1 of ISO/IEC 7810 standard defines them as 85.60 × 53.98 × 0.76 mm (3.370 × 2.125 × 0.030 in).

  7. Contactless payment - Wikipedia

    en.wikipedia.org/wiki/Contactless_payment

    EMV contactless symbol used on compatible payment terminals. EMV stands for "Europay, Mastercard, and Visa", the three companies that created the standard.Contactless payment systems are credit cards and debit cards, key fobs, smart cards, or other devices, including smartphones and other mobile devices, that use radio-frequency identification (RFID) or near-field communication (NFC) for ...