Credit cards

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Coursework in Credit Market

Credit Cards 
 
 
 
 

Student: …

Group:5302

Supervisor: … 
 
 

2011 
 

Table of Contents 
 
 

1. Introduction.......................................................................................................................3 

2. History...............................................................................................................................4 

3. How credit cards work.......................................................................................................9 

4. Real usage.........................................................................................................................10 

5. Stripe on a credit card.......................................................................................................11 

6. «Smart credit card»...........................................................................................................14 

7. Interest charges..................................................................................................................15 

8. Benefits to customers.........................................................................................................16 

9. Detriments to customers.....................................................................................................16 

10. Parties involved................................................................................................................19 

11. Transaction steps..............................................................................................................20 

12. Securitiy problems and solutions.....................................................................................22 

13. Conclusion.......................................................................................................................24 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Introduction 

Nowadays we live in the world, where the buying force of the individual is not more limited with yearly or monthly income, bonuses and relationships with the boss. Every human being at the moment can afford much more, than she or he really can buy. Since the credit cards was introduced in late 1950s, the human's universal wallet grew up amazingly. However and on whatever you want to spend money, you are free to do it.

Are you thinking about making a purchase? Among the payment choices tucked away in a consumer’s a wallet is the credit card. Its popularity since its debut in the late 1950s has skyrocketed. Many people enjoy the convenience and protections it offers, such as the ability to defer payments and keep records of purchases. However, credit cards can either help to improve your lifestyle by offering convenient payment and helping you build credit, or they can leave you with a pile a of debt - it all depends on how you use them. Problems can be avoided but understanding the terms of the credit card agreement, spending wisely and selecting the appropriate card.

Those little rectangles of plastic called credit cards have become an almost ubiquitous component of modern life. So much so that if you're one of the small percentage of people without a credit card you may well find it dificult buying tickets, reserving hotel rooms or even renting a car. It's almost as if the credit card has become an extension of our identity. To own one is to be a paid-up member of modern consumer society. What, then, are these wallet-sized pieces of plastic and how do they work? First I would like to start with the history of credit cards, and then explain how each of it and the whole system works. 
 
 
 
 
 
 
 
 
 

History 

As far back as the late 1800s, consumers and merchants exchanged goods through the concept of credit, using credit coins and charge plates as currency. It wasn't until about half a century ago that plastic payments as we know them today became a way of life. The concept of using a card for purchases was described in 1887 by Edward Bellamy in his utopian novel Looking Backward. Bellamy used the term credit card eleven times in this novel. The modern credit card was the successor of a variety of merchant credit schemes. It was first used in the 1920s, in the United States, specifically to sell fuel to a growing number of automobile owners. In 1938 several companies started to accept each other's cards. Western Union had begun issuing charge cards to its frequent customers in 1921. Some charge cards were printed on paper card stock, but were easily counterfeited. 

Early beginnings

In the early 1900s, oil companies and department stories issued their own proprietary cards, according to Stan Sienkiewicz, in a paper for the Philadelphia Federal Reserve entitled "Credit Cards and Payment Efficiency." Such cards were accepted only at the business that issued the card and in limited locations. While modern credit cards are mainly used for convenience, these predecessor cards were developed as a means of creating customer loyalty and improving customer service, Sienkiewicz says.

The first bank card, named "Charg-It," was introduced in 1946 by John Biggins, a banker in Brooklyn, according to MasterCard. When a customer used it for a purchase, the bill was forwarded to Biggins' bank. The bank reimbursed the merchant and obtained payment from the customer. The catches: Purchases could only be made locally, and Charg-It cardholders had to have an account at Biggins' bank. In 1951, the first bank credit card appeared in New York's Franklin National Bank for loan customers. It also could be used only by the bank's account holders.

The Diners Club Card was the next step in credit cards. According to a representative from Diners Club, the story began in 1949 when a man named Frank McNamara had a business dinner in New York's Major's Cabin Grill. When the bill arrived, Frank realized he'd forgotten his wallet. He managed to find his way out of the pickle, but he decided there should be an alternative to cash. McNamara and his partner, Ralph Schneider, returned to Major's Cabin Grill in February of 1950 and paid the bill with a small, cardboard card. Coined the Diners Club Card and used mainly for travel and entertainment purposes, it claims the title of the first credit card in widespread use.

The modern credit card was the successor of a variety of merchant credit schemes. It was first used in the 1920s, in the United States, specifically to sell fuel to a growing number of automobile owners. In 1938 several companies started to accept each other's cards. Western Union had begun issuing charge cards to its frequent customers in 1921. Some charge cards were printed on paper card stock, but were easily counterfeited.

The Charga-Plate, developed in 1928, was an early predecessor to the credit card and used in the U.S. from the 1930s to the late 1950s. It was a 2½" ×  1¼" rectangle of sheet metal related to Addressograph and military dog tag systems. It was embossed with the customer's name, city and state. It held a small paper card for a signature. In recording a purchase, the plate was laid into a recess in the imprinter, with a paper "charge slip" positioned on top of it. The record of the transaction included an impression of the embossed information, made by the imprinter pressing an inked ribbon against the charge slip. Charga-Plate was a trademark of Farrington Manufacturing Co. Charga-Plates were issued by large-scale merchants to their regular customers, much like department store credit cards of today. In some cases, the plates were kept in the issuing store rather than held by customers. When an authorized user made a purchase, a clerk retrieved the plate from the store's files and then processed the purchase. Charga-Plates speeded back-office bookkeeping that was done manually in paper ledgers in each store, before computers.

Plastic debuts


By 1951, there were 20,000 Diners Club cardholders. A decade later, the card was replaced with plastic. Diners Club Card purchases were made on credit, but it was technically a charge card, meaning the bill had to be paid in full at the end of each month.

According to its archivist, American Express formed in 1850. It specialized in deliveries as a competitor to the U.S. Postal Service, money orders (1882) and traveler's checks, which the company invented in 1891. The company discussed creating a travel charge card as early as 1946, but it was the launch of the rival Diners Club card that put things in motion.

In 1958 the company emerged into the credit card industry with its own pruduct, a purple charge card for travel and entertainment expenses. In 1959, American Express introduced the first card made of plastic (previous cards were made of cardboard or celluloid).

American Express soon introduced local currency credit cards in other countries. About 1 million cards were being used at about 85,000 establishements within the first five years, both in and out of the U.S. In the 1990s, the company expanded into an all-purpose card. American Express, or Amex as it often is called, is about to celebrate its 50th credit card anniversary.

Closed-loop system


The Diners Club and American Express cards "functioned in what is known as a 'closed-loop' system, made up of the consumer, the merchant and the issuer of the card," Sienkiewicz writes. "In this structure, the issuer both authorizes and handles all aspects of the transaction and settles directly with both the consumer and the merchant."

In 1959, the option of maintaining a revolving balance was introduced, according to MasterCard. This meant cardholders no longer had to pay off their full bills at the end of each cycle. While this carried the risk of accumulating finance charges, it gave customers greater flexibility in managing their money.

Bank card associations


"The general-purpose credit card was born in 1966, when the Bank of America established the BankAmerica Service Corporation that franchised the BankAmericard brand (later to be known as Visa) to banks nationwide," Sienkiewicz writes.

In 1966, a national credit card system was formed when a group of credit-issuing banks joined together and created the InterBank Card Association, according to MasterCard. The ICA is now known as MasterCard Worldwide, though it was temporarily known as MasterCharge. This organization competes directly with a similar Visa program.

"The new bank card associations were different from their predecessors in that an 'open-loop' system was now created, requiring interbank cooperation and funds transfers," Sienkiewicz says. Visa and MasterCard still maintain "open-loop" systems, whereas American Express, Diners Club and Discover Card remain "closed-loop."

Visa and MasterCard's organizations both issue credit cards through member banks and set and maintain the rules for processing. They are both run by board members who are mostly high-level executives from their member banking organizations.

As the bank card industry grew, banks interested in issuing cards became members of either the Visa association or MasterCard association. Their members shared card program costs, making the bank card program available to even small financial institutions. Later, changes to the association bylaws allowed banks to belong to both associations and issue both types of cards to their customers.

Credit card processing evolves


As credit card processing became more complicated, outside service companies began to sell processing services to Visa and MasterCard association members. This reduced the cost of programs for banks to issue cards, pay merchants and settle accounts with cardholders, thus allowing greater expansion of the payments industry.

Visa and MasterCard developed rules and standardized procedures for handling the bank card paper flow in order to reduce fraud and misuse of cards. The two associations also created international processing systems to handle the exchange of money and information and established an arbitration procedure to settle disputes between members.

Other issuers join the party


Although American Express was among the first companies to issue a charge card, it wasn't until 1987 that it issued a credit card allowing customers to pay over time rather than at the end of every month. Its original business model focused on the travel and entertainment charges made by business people, which involved significant revenue from merchants and annual membership fees from customers. While these products are still in its tool chest, the company has developed numerous no-annual fee credit cards offering low introductory rates and reward programs, similar to as traditional bank cards.

Another relatively recent entry into the card business is Discover Card, originally part of the Sears Corporation. According to Discover, its first card was unveiled at the 1986 Super Bowl. Discover Card Services sought to create a new brand with its own merchant network, and the company has been successful at developing merchant acceptance. A 2004 antitrust court ruling against Visa and MasterCard - initiated by the U.S. governement and the Department of Justice -- changed the exclusive relationship that Visa and MasterCard enjoyed with banks. It allows banks and other card issuers to provide customers with American Express or Discover cards, in addition to a Visa or MasterCard.

Although credit cards reached very high adoption levels in the US, Canada and the UK in the mid twentieth century, many cultures were more cash-oriented, or developed alternative forms of cash-less payments, such as Carte bleue or the Eurocard (Germany, France, Switzerland, and others). In these places, adoption of credit cards was initially much slower. It took until the 1990s to reach anything like the percentage market-penetration levels achieved in the US, Canada, or UK. In some countries, acceptance still remains poor as the use of a credit card system depends on the banking system being perceived as reliable. Japan remains a very cash oriented society, with credit card adoption being limited to only the largest of merchants, although an alternative system based on RFIDs inside cellphones has seen some acceptance. Because of strict regulations regarding banking system overdrafts, some countries, France in particular, were much faster to develop and adopt chip-based credit cards which are now seen as major anti-fraud credit devices. Debit cards and online banking are used more widely than credit cards in some countries.

The concept of customers paying different merchants using the same card was implemented in 1950 by Ralph Schneider and Frank McNamara, founders of Diners Club, to consolidate multiple cards. The Diners Club, which was created partially through a merger with Dine and Sign, produced the first "general purpose" charge card, and required the entire bill to be paid with each statement. That was followed by Carte Blanche and in 1958 by American Express which created a worldwide credit card network (although these were initially charge cards that acquired credit card features after BankAmericard demonstrated the feasibility of the concept).

However, until 1958, no one had been able to create a working revolving credit financial instrument issued by a third-party bank that was generally accepted by a large number of merchants (as opposed to merchant-issued revolving cards accepted by only a few merchants). A dozen experiments by small American banks had been attempted (and had failed). In September 1958, Bank of America launched the BankAmericard in Fresno, California. BankAmericard became the first successful recognizably modern credit card (although it underwent a troubled gestation during which its creator resigned), and with its overseas affiliates, eventually evolved into the Visa system. In 1966, the ancestor of MasterCard was born when a group of California banks established Master Charge to compete with BankAmericard; it received a significant boost when Citibank merged its proprietary Everything Card (launched in 1967) into Master Charge in 1969.

Early credit cards in the U.S., of which BankAmericard was the most prominent example, were mass produced and mass mailed unsolicited to bank customers who were thought to be good credit risks. But, “They have been mailed off to unemployables, drunks, narcotics addicts and to compulsive debtors, a process President Johnson’s Special Assistant Betty Furness found very like ‘giving sugar to diabetics’.” These mass mailings were known as "drops" in banking terminology, and were outlawed in 1970 due to the financial chaos that they caused, but not before 100 million credit cards had been dropped into the U.S. population. After 1970, only credit card applications could be sent unsolicited in mass mailings.

How credit cards work

Credit cards are issued by a credit card issuer, such as a bank or credit union, after an account has been approved by the credit provider, after which cardholders can use it to make purchases at merchants accepting that card. Merchants often advertise which cards they accept by displaying acceptance marks – generally derived from logos – or may communicate this orally, as in "Credit cards are fine" (implicitly meaning "major brands"), "We take (brands X, Y, and Z)", or "We don't take credit cards".

When a purchase is made, the credit card user agrees to pay the card issuer. The cardholder indicates consent to pay by signing a receipt with a record of the card details and indicating the amount to be paid or by entering a personal identification number (PIN). Also, many merchants now accept verbal authorizations via telephone and electronic authorization using the Internet, known as a card not present transaction (CNP).

Electronic verification systems allow merchants to verify in a few seconds that the card is valid and the credit card customer has sufficient credit to cover the purchase, allowing the verification to happen at time of purchase. The verification is performed using a cedit card paymernt terminal or piont-of-sale (POS) system with a communications link to the merchant's acquiring bank. Data from the card is obtained from a magnetic stripe or chip on the card; the latter system is called Chip and PIN in the United Kingdom and Ireland, and is implemented as an EMV card.

For card not present transactions where the card is not shown (e.g., e-commerce, mail order, and telephone sales), merchants additionally verify that the customer is in physical possession of the card and is the authorized user by asking for additional information such as the security code printed on the back of the card, date of expiry, and billing address.

Each month, the credit card user is sent a statement indicating the purchases undertaken with the card, any outstanding fees, and the total amount owed. After receiving the statement, the cardholder may dispute any charges that he or she thinks are incorrect (see 15 U.S.C.§ 1643, which limits cardholder liability for unauthorized use of a credit card to $50, and the Fair Credit Billing Act for details of the US regulations). Otherwise, the cardholder must pay a defined minimum proportion of the bill by a due date, or may choose to pay a higher amount up to the entire amount owed. The credit issuer charges interest on the amount owed if the balance is not paid in full (typically at a much higher rate than most other forms of debt). In addition, if the credit card user fails to make at least the minimum payment by the due date, the issuer may impose a "late fee" and/or other penalties on the user. To help mitigate this, some financial institutions can arrange for automatic payments to be deducted from the user's bank accounts, thus avoiding such penalties altogether as long as the cardholder has sufficient funds.

Real usage 

Although phone companies, gas companies and department stores have their own numbering systems, ANSI Standard X4.13-1983 is the system used by most national credit-card systems.

Here are what some of the numbers stand for:

The first digit in your credit-card number signifies the system: 

• 3 - travel/entertainment cards (such as American Express and Diners Club)
• 4 - Visa
• 5 - MasterCard
• 6 - Discover Card

The structure of the card number varies by system. For example, American Express card numbers start with 37; Carte Blanche and Diners Club with 38. 

• American Express - Digits three and four are type and currency, digits five through 11 are the account number, digits 12 through 14 are the card number within the account and digit 15 is a check digit.
• Visa - Digits two through six are the bank number, digits seven through 12 or seven through 15 are the account number and digit 13 or 16 is a check digit.
• MasterCard - Digits two and three, two through four, two through five or two through six are the bank number (depending on whether digit two is a 1, 2, 3 or other). The digits after the bank number up through digit 15 are the account number, and digit 16 is a check digit.

Stripe on a credit card 

The stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a tiny bar magnet about 20-millionths of an inch long.

The magstripe can be "written" because the tiny bar magnets can be magnetized in either a north or south pole direction. The magstripe on the back of the card is very similar to a piece of cassette tape.

A magstripe reader can understand the information on the three-track stripe. If the ATM isn't accepting your card, your problem is probably either:

An erased magstripe (The most common causes for erased magstripes are exposure to magnets, like the small ones used to hold notes and pictures on the refrigerator, and exposure to a store's electronic article surveillance (EAS) tag demagnetizer.)

There are three tracks on the magstripe. Each track is about one-tenth of an inch wide. The ISO/IEC standard 7811, which is used by banks, specifies:

Track one is 210 bits per inch (bpi), and holds 79 6-bit plus parity bit read-only characters.

Track two is 75 bpi, and holds 40 4-bit plus parity bit characters.

Track three is 210 bpi, and holds 107 4-bit plus parity bit characters.

Your credit card typically uses only tracks one and two.

Track three is a read/write track (which includes an encrypted PIN, country code, currency units and amount authorized), but its usage is not standardized among banks.

The information on track one is contained in two formats: A, which is reserved for proprietary use of the card issuer, and B, which includes the following:

• Start sentinel - one character
• Format code="B" - one character (alpha only)
• Primary account number - up to 19 characters
• Separator - one character
• Country code - three characters
• Name - two to 26 characters
• Separator - one character
• Expiration date or separator - four characters or one character
• Discretionary data - enough characters to fill out maximum record length (79 characters total)
• End sentinel - one character
• Longitudinal redundancy check (LRC) - one character LRC is a form of computed check character.

The format for track two, developed by the banking industry, is as follows:

• Start sentinel - one character
• Primary account number - up to 19 characters
• Separator - one character
• Country code - three characters
• Expiration date or separator - four characters or one character
• Discretionary data - enough characters to fill out maximum record length (40 characters total)
• LRC - one character

There are three basic methods for determining whether your credit card will pay for what you're charging:

• Merchants with few transactions each month do voice authentication using a touch-tone phone.
• Electronic data capture (EDC) magstripe-card swipe terminals are becoming more common -- so is swiping your own card at the checkout.
• Virtual terminals on the Internet

This is how it works: After you or the cashier swipes your credit card through a reader, the EDC software at the point-of-sale (POS) terminal dials a stored telephone number (using a modem) to call an acquirer. An acquirer is an organization that collects credit-authentication requests from merchants and provides the merchants with a payment guarantee.

When the acquirer company gets the credit-card authentication request, it checks the transaction for validity and the record on the magstripe for:

• Merchant ID
• Valid card number
• Expiration date
• Credit-card limit
• Card usage

Single dial-up transactions are processed at 1,200 to 2,400 bits per second (bps), while direct Internet attachment uses much higher speeds via this protocol. In this system, the cardholder enters a personal identification number (PIN) using a keypad.

The PIN is not on the card -- it is encrypted (hidden in code) in a database. (For example, before you get cash from an ATM, the ATM encrypts the PIN and sends it to the database to see if there is a match.) The PIN can be either in the bank's computers in an encrypted form (as a cipher) or encrypted on the card itself. The transformation used in this type of cryptography is called one-way. This means that it's easy to compute a cipher given the bank's key and the customer's PIN, but not computationally feasible to obtain the plain-text PIN from the cipher, even if the key is known.

This feature was designed to protect the cardholder from being impersonated by someone who has access to the bank's computer files.

Likewise, the communications between the ATM and the bank's central computer are encrypted to prevent would-be thieves from tapping into the phone lines, recording the signals sent to the ATM to authorize the dispensing of cash and then feeding the same signals to the ATM to trick it into unauthorized dispensing of cash. 

"Smart" credit card

The "smart" credit card is an innovative application that involves all aspects of cryptography (secret codes), not just the authentication we described in the last section. A smart card has a microprocessor built into the card itself. Cryptography is essential to the functioning of these cards in several ways:

• The user must corroborate his identity to the card each time a transaction is made, in much the same way that a PIN is used with an ATM.
• The card and the card reader execute a sequence of encrypted sign/countersign-like exchanges to verify that each is dealing with a legitimate counterpart.
• Once this has been established, the transaction itself is carried out in encrypted form to prevent anyone, including the cardholder or the merchant whose card reader is involved, from "eavesdropping" on the exchange and later impersonating either party to defraud the system.

This elaborate protocol is conducted in such a way that it is invisible to the user, except for the necessity of entering a PIN to begin the transaction.

Smart cards first saw general use in France in 1984. They are now hot commodities that are expected to replace the simple plastic cards most of us use now. Visa and MasterCard are leading the way in the United States with their smart card technologies.

The chips in these cards are capable of many kinds of transactions. For example, you could make purchases from your credit account, debit account or from a stored account value that's reloadable. The enhanced memory and processing capacity of the smart card is many times that of traditional magnetic-stripe cards and can accommodate several different applications on a single card. It can also hold identification information, keep track of your participation in an affinity (loyalty) program or provide access to your office. 
 
 
 
 

Interest charges 

Credit card issuers usually waive interest charges if the balance is paid in full each month, but typically will charge full interest on the entire outstanding balance from the date of each purchase if the total balance is not paid.

For example, if a user had a $1,000 transaction and repaid it in full within this grace period, there would be no interest charged. If, however, even $1.00 of the total amount remained unpaid, interest would be charged on the $1,000 from the date of purchase until the payment is received. The precise manner in which interest is charged is usually detailed in a cardholder agreement which may be summarized on the back of the monthly statement. The general calculation formula most financial institutions use to determine the amount of interest to be charged is APR/100 x ADB/365 x number of days revolved. Take the annual percentage rate (APR) and divide by 100 then multiply to the amount of the average daily balance (ADB) divided by 365 and then take this total and multiply by the total number of days the amount revolved before payment was made on the account. Financial institutions refer to interest charged back to the original time of the transaction and up to the time a payment was made, if not in full, as RRFC or residual retail finance charge. Thus after an amount has revolved and a payment has been made, the user of the card will still receive interest charges on their statement after paying the next statement in full (in fact the statement may only have a charge for interest that collected up until the date the full balance was paid, i.e. when the balance stopped revolving).

The credit card may simply serve as a form of revolving credit, or it may become a complicated financial instrument with multiple balance segments each at a different interest rate, possibly with a single umbrella credit limit, or with separate credit limits applicable to the various balance segments. Usually this compartmentalization is the result of special incentive offers from the issuing bank, to encourage balance transfers from cards of other issuers. In the event that several interest rates apply to various balance segments, payment allocation is generally at the discretion of the issuing bank, and payments will therefore usually be allocated towards the lowest rate balances until paid in full before any money is paid towards higher rate balances. Interest rates can vary considerably from card to card, and the interest rate on a particular card may jump dramatically if the card user is late with a payment on that card or any other credit instrument, or even if the issuing bank decides to raise its revenue. 
 

Benefits to customers 

The main benefit to each customer is convenience. Compared to debit cards and cheques, a credit card allows small short-term loans to be quickly made to a customer who need not calculate a balance remaining before every transaction, provided the total charges do not exceed the maximum credit line for the card. Credit cards also provide more fraud protection than debit cards. In the UK for example, the bank is jointly liable with the merchant for purchases of defective products over £100.

Many credit cards offer rewards and benefits packages, such as offering enhanced product warranties at no cost, free loss/damage coverage on new purchases, and points which may be redeemed for cash, products, or airline tickets. Additionally, carrying a credit card may be a convenience to some customers as it eliminates the need to carry any cash for most purposes. 

Detriments to customers 

High interest and bankruptcy

Low introductory credit card rates are limited to a fixed term, usually between 6 and 12 months, after which a higher rate is charged. As all credit cards charge fees and interest, some customers become so indebted to their credit card provider that they are driven to bankruptcy. Some credit cards often levy a rate of 20 to 30 percent after a payment is missed; in other cases a fixed charge is levied without change to the interest rate. In some cases universal default may apply: the high default rate is applied to a card in good standing by missing a payment on an unrelated account from the same provider. This can lead to a snowball effect in which the consumer is drowned by unexpectedly high interest rates. Further, most card holder agreements enable the issuer to arbitrarily raise the interest rate for any reason they see fit. As of December 2009, First Premier Bank is reportedly offering a credit card with a 79.9% interest rate.

Inflated pricing for all consumers

Merchants that accept credit cards must pay interchange fees and discount fees on all credit-card transactions. In some cases merchants are barred by their credit agreements from passing these fees directly to credit card customers, or from setting a minimum transaction amount (no longer prohibited in the United States). The result is that merchants may charge all customers (including those who do not use credit cards) higher prices to cover the fees on credit card transactions. In the United States in 2008 credit card companies collected a total of $48 billion in interchange fees, or an average of $427 per family, with an average fee rate of about 2% per transaction. 

Grace period

A credit card's grace period is the time the customer has to pay the balance before interest is assessed on the outstanding balance. Grace periods may vary, but usually range from 20 to 50 days depending on the type of credit card and the issuing bank. Some policies allow for reinstatement after certain conditions are met.

Usually, if a customer is late paying the balance, finance charges will be calculated and the grace period does not apply. Finance charges incurred depend on the grace period and balance; with most credit cards there is no grace period if there is any outstanding balance from the previous billing cycle or statement (i.e. interest is applied on both the previous balance and new transactions). However, there are some credit cards that will only apply finance charge on the previous or old balance, excluding new transactions.

Benefits to merchants

For merchants, a credit card transaction is often more secure than other forms of payment, such as cheques, because the issuing bank commits to pay the merchant the moment the transaction is authorized, regardless of whether the consumer defaults on the credit card payment (except for legitimate disputes, which are discussed below, and can result in charges back to the merchant). In most cases, cards are even more secure than cash, because they discourage theft by the merchant's employees and reduce the amount of cash on the premises.

Prior to credit cards, each merchant had to evaluate each customer's credit history before extending credit. That task is now performed by the banks which assume the credit risk. Credit cards can also aid in securing a sale, especially if the customer does not have enough cash on his or her person or checking account. Extra turnover is generated by the fact that the customer can purchase goods and/or services immediately and is less inhibited by the amount of cash in his or her pocket and the immediate state of his or her bank balance. Much of merchants' marketing is based on this immediacy.

For each purchase, the bank charges the merchant a commission (discount fee) for this service and there may be a certain delay before the agreed payment is received by the merchant. The commission is often a percentage of the transaction amount, plus a fixed fee (interchange rate). In addition, a merchant may be penalized or have their ability to receive payment using that credit card restricted if there are too many cancellations or reversals of charges as a result of disputes. Some small merchants require credit purchases to have a minimum amount to compensate for the transaction costs.

In some countries, for example the Nordic countries, banks guarantee payment on stolen cards only if an ID card is checked and the ID card number/civic registration number is written down on the receipt together with the signature. In these countries merchants therefore usually ask for ID. Non-Nordic citizens, who are unlikely to possess a Nordic ID card or driving license, will instead have to show their passport, and the passport number will be written down on the receipt, sometimes together with other information. Some shops use the card's PIN for identification, and in that case showing an ID card is not necessary. 

Costs to merchants

Merchants are charged several fees for the privilege of accepting credit cards. The merchant is usually charged a commission of around 1 to 3 per-cent of the value of each transaction paid for by credit card. The merchant may also pay a variable charge, called an interchange rate, for each transaction. In some instances of very low-value transactions, use of credit cards will significantly reduce the profit margin or cause the merchant to lose money on the transaction. Merchants must accept these transactions as part of their costs to retain the right to accept credit card transactions. Merchants with very low average transaction prices or very high average transaction prices are more averse to accepting credit cards. In some cases merchants may charge users a "credit card supplement", either a fixed amount or a percentage, for payment by credit card. This practice is prohibited by the credit card contracts in the United States, although the contracts allow the merchants to give discounts for cash payment. 
 
 
 
 
 
 
 

Parties involved 

• Cardholder: The holder of the card used to make a purchase; the consumer.
• Card-issuing bank: The financial institution or other organization that issued the credit card to the cardholder. This bank bills the consumer for repayment and bears the risk that the card is used fraudulently. American Express and Discover were previously the only card-issuing banks for their respective brands, but as of 2007, this is no longer the case. Cards issued by banks to cardholders in a different country are known as offshore credit cards.
• Merchant: The individual or business accepting credit card payments for products or services sold to the cardholder.
• Acquiring bank: The financial institution accepting payment for the products or services on behalf of the merchant.
• Independent sales organization: Resellers (to merchants) of the services of the acquiring bank.
• Merchant account: This could refer to the acquiring bank or the independent sales organization, but in general is the organization that the merchant deals with.
• Credit Card association: An association of card-issuing banks such as Visa, MasterCard, Discover, American Express, etc. that set transaction terms for merchants, card-issuing banks, and acquiring banks.
• Transaction network: The system that implements the mechanics of the electronic transactions. May be operated by an independent company, and one company may operate multiple networks.
• Affinity partner: Some institutions lend their names to an issuer to attract customers that have a strong relationship with that institution, and get paid a fee or a percentage of the balance for each card issued using their name. Examples of typical affinity partners are sports teams, universities, charities, professional organizations, and major retailers.

Transaction steps 

Authorization: The cardholder pays for the purchase and the merchant submits the transaction to the acquirer (acquiring bank). The acquirer verifies the credit card number, the transaction type and the amount with the issuer (Card-issuing bank) and reserves that amount of the cardholder's credit limit for the merchant. An authorization will generate an approval code, which the merchant stores with the transaction.