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  2. PhonePe - Wikipedia

    en.wikipedia.org/wiki/PhonePe

    PhonePe helps merchants to accept payments through all UPI-based apps, debit and credit card, as well as wallet (Including third party wallets) on the app. 2017. In October, PhonePe launched a low-cost POS device built in India. The Bluetooth enabled POS device looks like a calculator and works with AA batteries.

  3. One-time password - Wikipedia

    en.wikipedia.org/wiki/One-time_password

    In some countries' online banking, the bank sends to the user a numbered list of OTPs that is printed on paper. Other banks send plastic cards with actual OTPs obscured by a layer that the user has to scratch off to reveal a numbered OTP. For every online transaction, the user is required to enter a specific OTP from that list.