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2. 3-D Secure - Wikipedia

   en.wikipedia.org/wiki/3-D_Secure

   3-D Secure. 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. Proof-of-payment - Wikipedia

   en.wikipedia.org/wiki/Proof-of-payment

   Proof-of-payment (POP) or proof-of-fare (POF) is an honor -based fare collection system used on many public transportation systems. Instead of checking each passenger as they enter a fare control zone, passengers are required to carry a paper ticket, transit pass, transit smartcard - or open payment methods such as contactless credit or debit ...

4. 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 secure fashion.

5. Get help with your AOL billing questions - AOL Help

   help.aol.com/articles/account-management...

   If your account is past due or you want to upgrade your account to a paid plan or Premium Service, you’ll need to update your account’s payment method. 1. Learn which payment methods are available for AOL services. 2. Learn how to add, change or delete a payment method.

6. 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 ...

7. Payment system - Wikipedia

   en.wikipedia.org/wiki/Payment_system

   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 ...