Credit card system generally consists of transaction management, communication authorization, transaction clearing, form processing and other subsystems.

1. The transaction processing subsystem has the functions of account management, card account management, merchant management, authorization management, stop payment list management, online search and so on.

2.POS authorization and telephone authorization functions are set in the communication authorization subsystem.

3. Set the functions of deposit, withdrawal, consumption, loan repayment, interest calculation, internal settlement and account inquiry in the transaction clearing subsystem.

4. The form processing subsystem has online printing functions such as printing transaction list, statement, account cancellation notice, loan voucher and interest summons.