Merchant's-electronic device that enables the e - payments. It reads the card information from EMV or magnetic strip

A magnetics tripe or chip card that holds the value of money to offer as a gift by a E - business

It is used allow users to make electronic transactions quickly and securely over the Internet

Blockchains are an open distributed book that records transactions of cryptocurrencies.

The cryptocurrency units are created by the solution of cryptographic tasks called mining.

Altcoins is the collective name for all cryptocurrencies that appeared after Bitcoin.

A crypto currency is a unique virtual asset designed to work as a medium of exchange.

Hologram is a security feature that prevents duplication.

It is an iron based magnetic material containing encrypted data about the card holder and account number.

Credit card is an electronic payment system normally used for retail transactions.

Credit card, Debit card, Stored value card

Payment cards are plastic cards that enable cashless payments. They are simple embossed plastic card that authenticates the card holder on behalf of card issuing company, which allows the user to make use of various financial services.

(i) Electronic wallets (e-wallets) or electronic purses allow users to make electronic transactions quickly and securely over the Internet through smartphones (or) computers.
(ii) The electronic wallet functions almost the same as a physical wallet in term that it holds our money
(iii) Electronic wallets were first recognized as a method for storing money in electronic form, and became popular because It provides a convenient way for online shopping.

Based on the algorithm used, it is classified into the following categories.
(i) Hash chain based micro electronic payment systems.
(ii) Hash collisions and hash sequences based micro electronic payment systems.
(iii) Shared secrete keys based micro electronic payment systems.
(iv) Probability based micro electronic payment systems.