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2. E-commerce payment system - Wikipedia

   en.wikipedia.org/wiki/E-commerce_payment_system

   Methods of online payment. There are varied types of electronic payment methods such as online credit card transactions, e-wallets, e-cash and wireless payment system. Credit cards constitute a popular method of online payment but can be expensive for the merchant to accept because of transaction fees primarily. Debit cards constitute an ...

3. 3-D Secure - Wikipedia

   en.wikipedia.org/wiki/3-D_Secure

   3-D Secure. Not to be confused with card security code. 3-D Secure is a protocol designed to be an additional security layer for online credit and debit card transactions. The name refers to the "three domains" which interact using the protocol: the merchant/acquirer domain, the issuer domain, and the interoperability domain. [1]

4. PayPal - Wikipedia

   en.wikipedia.org/wiki/PayPal

   eBay, PayPal, Kijiji and StubHub, 500 King Street West, Toronto, April 2014. PayPal Holdings, Inc. is an American multinational financial technology company operating an online payments system in the majority of countries that support online money transfers; it serves as an electronic alternative to traditional paper methods such as checks and money orders.

5. Payment system - Wikipedia

   en.wikipedia.org/wiki/Payment_system

   A payment system is any system used to settle financial transactions through the transfer of monetary value. This includes the institutions, payment instruments such as payment cards, people, rules, procedures, standards, and technologies that make its exchange possible. [1] [2] A payment system is an operational network which links bank ...

6. Secure Electronic Transaction - Wikipedia

   en.wikipedia.org/wiki/Secure_Electronic_Transaction

   Secure Electronic Transaction (SET) is a communications protocol standard for securing credit card transactions over networks, specifically, the Internet. SET was not itself a payment system , but rather a set of security protocols and formats that enabled users to employ the existing credit card payment infrastructure on an open network in a ...

7. Square (financial services) - Wikipedia

   en.wikipedia.org/wiki/Square_(financial_services)

   Square is a financial services platform by Block, Inc. for small and medium-sized businesses. [1] [2] It enables accepting credit card payments using smartphones as POS registers, and facilitates various business operations. As of 2023, Square reports 4 million merchant clients and an annual payment value of US$ 210 billion.