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Issuers
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Credit card issuers are financial institutions that financially back the credit cards. They are responsible for approving (or denying) credit card applications from their customers, setting the terms of a credit line and any account benefit. The issuer deals with authorising payments, and settling transactions on behalf of the customer/cardholder, as well as collecting payments from, and providing operational services (e.g. statements, dispute resolution) to their customers/cardholders.
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Acquirers
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Credit card acquirers are financial institutions that process debit and credit card payments on behalf of a merchant. Acquirers allow merchants to accept debit and credit card payments from cardholders.
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Merchants
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Merchants are businesses providing goods and services for which they accept debit and credit card payments from customers. Merchants are also clients of an acquiring bank or financial institution.
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Cardholder
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Cardholders are the customers of the issuer, and the users of the debit/credit cards. The cardholder is also the customer of the merchant, purchasing goods or services with their card.
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Schemes
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Credit card schemes are payment networks which own a scheme brand (e.g. Visa, Mastercard) which banks and other financial institutions can be licenced to use in order to issue or acquire cards. Issuers and acquirers are clients of the schemes, and in addition to having a brand licence may use the network to process payment card transactions.