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  2. Google Pay (payment method) - Wikipedia

    en.wikipedia.org/wiki/Google_Pay_(payment_method)

    When the user makes a payment to a merchant, Google Pay does not send the actual payment card number. Instead, it generates a virtual account number representing the user's account information. [3] Google Pay requires that a screen lock be set on the phone or watch. [4]

  3. PayNow - Wikipedia

    en.wikipedia.org/wiki/PayNow

    PayNow is a near-instant real-time payment system developed by Association of Banks in Singapore. [1] The interface facilitates inter-bank peer-to-peer and person-to-merchant transactions. The system is supported by all major Singaporean banks and is regulated by the Monetary Authority of Singapore (MAS) and works by transferring funds between ...

  4. Merchant plug-in - Wikipedia

    en.wikipedia.org/wiki/Merchant_plug-in

    A merchant plug-in (MPI) is a software module designed to facilitate 3-D Secure verifications to help prevent credit card fraud. [1] The MPI identifies the account number and queries the servers of the card issuer (Visa, MasterCard, or JCB International) to determine if it is enrolled in a 3D-Secure program and returns the web site address of the issuer access control server (ACS) if it is ...

  5. Payment gateway - Wikipedia

    en.wikipedia.org/wiki/Payment_gateway

    When a customer orders a product from a payment gateway-enabled merchant, the payment gateway performs a variety of tasks to process the transaction. [2] [failed verification] The order is placed. The payment gateway may allow transaction data to be sent directly from the customer's browser to the gateway, bypassing the merchant's systems.

  6. List of online payment service providers - Wikipedia

    en.wikipedia.org/wiki/List_of_online_payment...

    The following is a list of notable online payment service providers and payment gateway providing companies, their platform base and the countries they offer services in: (POS -- Point of Sale ) Company

  7. Mobile payment - Wikipedia

    en.wikipedia.org/wiki/Mobile_payment

    Users download UPI supporting app from app stores on their Android or iOS device, link and verify their mobile number with the bank account by sending one outgoing SMS to app provider, create a virtual payment address (VPA) which auto generates a QR code and then set a banking PIN by generating OTP for secure transactions. VPA and QR codes are ...

  8. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    (Compare with 405 Method Not Allowed, where the server recognizes the method but does not allow or support it.) [1]: §21.5.2 502 Bad Gateway The server is acting as a gateway or proxy, and received an invalid response from a downstream server while attempting to fulfill the request. [1]: §21.5.3 503 Service Unavailable

  9. Instant payment notification - Wikipedia

    en.wikipedia.org/wiki/Instant_Payment_Notification

    Instant payment notification (IPN) is a method for online retailers to automatically track purchases and other server-to-server communication in real time. This allows E-commerce systems the opportunity to store payment transactions, order information and other sales internally.