1.1 Defining Payment Systems
A payment system is the set of instruments, banking procedures, and interbank funds transfer systems that ensure the circulation of money within an economy . It is the essential infrastructure that enables financial transactions between payers and beneficiaries. Payment systems are a major channel by which financial shocks can be transmitted across domestic and international markets .

1.2 Key Participants and Components
Every national payment system consists of several key participants :

  • The Central Bank: The primary overseer, operator of critical infrastructure, and provider of settlement accounts.

  • Commercial Banks and Financial Institutions: The primary users of the system on behalf of their customers.

  • Payment System Providers: Non-bank entities authorized to provide payment services.

  • The Government: A major user for its own transactions.

  • Customers: Both individuals and businesses who initiate and receive payments.

Payment systems are a critical component of a country’s financial system and are often categorized into Large Value (Wholesale) and Low Value (Retail) Payment Systems . Understanding the framework is crucial for analyzing how funds move securely through banking networks .

1.3 The Role of Central Banks
Central banks play a central, multi-faceted role in ensuring the soundness and efficiency of payment systems . Their functions include :

  • Overseer: To promote efficiency and soundness.

  • Supervisor: To maintain integrity and confidence in the system.

  • Facilitator of Settlement: By providing settlement accounts to commercial banks.

  • Provider: Operating key systems like RTGS.

  • User: For their own transactions.

  • Provider of Liquidity: To facilitate efficient settlement.

  • Catalyst/Collaborator: Spurring change and providing a platform for dialogue.

Central banks seek to ensure payment systems do not generate high levels of risk, continue to operate without major disruptions, and offer efficient, reliable, and safe services .