The simplest and oldest form of payment is barter, the exchange of one good or service for another. In the modern world, common means of payment by an individual include money, cheque,debit, credit, or bank transfer, and in trade such payments are frequently preceded by an invoice or result in a receipt. However, there are no arbitrary limits on the form a payment can take and thusin complex transactions between businesses, payments may take the form of stock or other more complicated arrangements.
In law, the payer is the party making a payment while the payee is the partyreceiving the payment.
 Payment methods
There are two types of payment methods; exchanging and provisioning. Exchanging is to change coin, money and banknote in terms of the price.Provisioning is to transfer money from one account to another. In this method a third party must be involved. Credit card, debit card, money transfers, and recurring cash or ACH (Automated Clearing House)disbursements are all electronic payments methods. Electronic payments technologies are magnetic stripe card, smartcard, contactless card and mobile handset. Mobile handset based payments are calledmobile payments.
 Parties involved
Payments may be classified by the number of parties involved to consummate a transaction. For example, a credit card transaction in the United Statesrequires a minimum of four parties (the purchaser, the seller, the issuing bank, and the acquiring bank). A cash payment requires a minimum of three parties (the seller, the purchaser, and the issuer ofthe currency). A barter payment requires a minimum of two parties (the purchaser and the seller).
The infrastructure and electronic clearing methods are formed by the payment...