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All the security issues in the payment system through online system come in category of Security threats to E-commerce. before we procede further we need to know following things.   Electronic payment system An e-payment system is a way of making transactions or paying for goods and services through an electronic medium, without the use of checks or cash. It’s also called an electronic payment system or online payment system Payment Gateway A payment gateway is an e-commerce service that processes credit card payments for online and traditional brick and mortar stores. Payment gateways facilitate these transactions by transferring key information between payment portals such as web-enabled mobile devices/websites and the front end processor/bank. Payment gateways include PayPal, Google Pay( TEZ ), Apple Pay, Ali Pay and Amazon Pay.

Private network the Internet addressing architecture, a private network is a network that uses private IP address space. Both, the IPv4 and the IPv6 specifications define private addressing ranges. These addresses are commonly used for local area networks in residential, office, and enterprise environments. Intranet An intranet is a private network accessible only to an organization's staff. Often, a wide range of information and services are available on an organization's internal intranet that are unavailable to the public, unlike the Internet Extranet An extranet is a controlled private network that allows access to partners, vendors and suppliers or an authorized set of customers – normally to a subset of the information accessible from an organization's intranet. An extranet is similar to a DMZ in that it provides access to needed services for authorized parties, without granting access to an organization's entire network. An extranet is a private n...

FIREWALL:   a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet. Firewalls are often categorized as either network firewalls or host-based firewalls. Network firewalls filter traffic between two or more networks and run on network hardware. Host-based firewalls run on host computers and control network traffic in and out of those machines.   VPN(virtual private network):  A virtual private network (VPN) extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network. Applications running across a VPN may therefore benefit from the functionality, security, and management of the private network. VPN technology wa...

MI5 (Security Services) is often overlooked as an organisation that invests in technology. The reality is that we have pioneering corporate and operational technology sections which offer careers in technology that are very different from any other organisation. https://www.mi5.gov.uk/careers/opportunities/technology?adhoc_referrer=011617032006 Also more vacancies here:- https://