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2. 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]

3. EMV - Wikipedia

   en.wikipedia.org/wiki/EMV

   An EMV credit card. EMV is a payment method based on a technical standard for smart payment cards and for payment terminals and automated teller machines which can accept them. EMV stands for " Europay, Mastercard, and Visa ", the three companies that created the standard. [1]

4. 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.

5. Payment processor - Wikipedia

   en.wikipedia.org/wiki/Payment_processor

   A payment processor is a system that enables financial transactions, commonly employed by a merchant, to handle transactions with customers from various channels such as credit cards and debit cards or bank accounts. They are usually broken down into two types: front-end and back-end. Front-end processors have connections to various card ...

6. Square Gets a $200 Million Valuation: Is This the Next PayPal?

   www.aol.com/2011/01/03/square-200-million...

   According to Sarah Lacy and Mike Arrington over at TechCrunch, mobile payments startup Square just got a new round of funding and a snazzy new valuation of $200 million. The company's rise is ...

7. Small business credit cards vs. corporate credit cards: What ...

   www.aol.com/finance/small-business-credit-cards...

   Small-business cards are typically designed to meet the needs of small businesses, while corporate credit cards are better suited to the needs of corporates with millions of dollars in annual ...