The Address Verification Service (AVS) is a security system designed to combat one of the most common forms of online credit card fraud. AVS compares the billing address information provided by the customer with the billing address on file at the customers credit card issuer.
With Dual Comm Credit Card Terminals processing transactions takes just seconds, when processing securely using Secure Sockets Layer (SSL) encryption through the Internet Protocol (IP) from your existing DSL, Cable, Fiber or other broadband connection.
Khan Academy shares this great informative video about who's who in the world of credit card processing and what role the processor plays in your business.

Question: - I would like to understand that if a merchant (who is using POS supplied by acquiring bank) wishes to setup is own site and allows customers to purchase online (Not really new now except security applied here!), How it actually processes the credit card transaction?
Pay your credit card bill onlineCheck your balance and account activity from your laptop or mobile deviceLog in to Online Banking. The convenience and security of Online Banking from almost...

Online credit card processing, which allow businesses to conduct financial transactions, is one security option. A payment gateway processes transactions and must adhere to Payment Card Industry Data Security Standards (PCI DSS).
Mobile credit card processing is a type of software and hardware that enables a more modern and seamless checkout experience. This type of processing solution has more advantages for businesses both in-store and online.

Furthermore, visual representations like the one above help us fully grasp the concept of Online Credit Card Processing Security.
To avoid chargebacks, follow proper credit card processing procedures and use an online credit card processing company with strong security standards and clear payment descriptors.
Credit Card Processing. Targeted Merchant Solutions allows your business to accept payments from anywhere at any time. We provide innovative payment technology, transparent pricing, and 24/7 customer support from in person or on the go.