Digital Banking Systems and Sustainability Lecture Notes

Digitization of Cheque Payments

The process of cashing a cheque through contemporary digital applications involves several sophisticated steps. A web-based application first requests an image of the cheque, which the payee captures using a smartphone or online portal. An AI-based algorithm then analyzes the image to detect patterns in the handwriting, converting physical writing into digital characters representing letters and numbers. These digitized details are sent from the payee’s bank to the payer’s bank via an interbank communication system. At the payer’s bank, another algorithm verifies that the digitized details match the bank's files and ensures that sufficient funds exist in the payer’s account. Once validated, the payer’s bank transfers funds to the payee’s bank, resulting in the payee’s account being credited and the payer’s account being debited.

Rationale for Continued Cheque Usage

Despite the rise of digital alternatives, cheques remain relevant for several reasons:

Audit and Paper Trails: Paying by cheque maintains a physical record, which is beneficial for audit purposes.
Cybersecurity: Paper-based payments are generally less exposed to digital security risks.
Habit and Convention: Long-standing counterparties may continue using cheques out of established habit.
Accessibility and Tangibility: Some individuals lack access to digital tools or simply prefer dealing with tangible payment methods.
Cultural Factors: In the USA, in the year $2021$ , out of $204.5$ billion payments, $11.2$ billion were made by cheque. This equates to $548$ cheque payments per $10,000$ total payments, indicating a higher cultural preference in the USA compared to the UK.

The Role of AI in Global Digitization

Countries worldwide, including South Africa, Finland, Canada, and Malaysia, have updated laws to allow digital images of cheques to replace physical ones. AI is the enabling technology for this transition. Beyond handwriting recognition, algorithms perform critical validation checks: ensuring the credited account matches the payee, verifying that written words and figures agree (e.g., in amount), and checking that the date provided is neither in the future nor too far in the past.

In the UK, clearing banks utilize the Image Clearing System (ICS). This system transmits images between banks, such as HSBC UK in $2023$ , significantly reducing the environmental impact by eliminating the need to transport physical paper.

Historical Context: Clearing and Settlement

Traditionally, "clearing" involved interbank communication through physical paper exchange via a third-party organization known as a clearing house. Following this physical swap, banks would update their ledgers for debits and credits. The net difference in total debt between institutions was settled through their respective accounts at the central bank. A cheque is considered "cleared" once it has been successfully debited from the payer's account.

This digitization technology is also applied to bank giro credits, which are used to credit accounts for utility bills, credit cards, and tax demands. When processed at bank branches or financial service organizations, these are digitized in the same manner as cheques.

The Digital Infrastructure of the Banking System

The banking system's digital infrastructure is categorized into three primary sub-systems:

1. Customer-Facing Systems

These are user interfaces that provide access to services. They include call centres, mobile phones, online portals, digital voice assistants, and cash machines (ATMs). For effective adoption, these systems must be intuitive and simple, mirroring the user experience of companies like Apple or Google.

2. Back-Office Systems

Hidden from public view, these systems are vital for functionality. Historically, records were handwritten in ledgers. Modern systems evolved as follows:

1950s: Payment processing systems introduced.
1960s: Accounting software began.
1980s: Customer Relationship Management (CRM) and Point-of-Sale (POS) systems appeared. These have since been integrated and improved continuously.

3. Networking Systems

These involve interbank transaction collaborations, creating multi-national bodies for transferring payments and securities via national, regional, and global systems. Networking also encompasses non-bank entities like PayPal.

Customer Interface Systems and Evolution

Automatic Teller Machines (ATMs)

Introduced in the $1960s$ , ATMs originally only allowed cash withdrawals without a link to account details. They utilized plastic cards and had a withdrawal limit of $\pounds10$ . By providing access at any time, they redefined "banking hours," which traditionally in the UK were from $09.30am$ to $3.30pm$ (closing at $3.00pm$ in London to allow for daily paper cheque clearing).

Bank Kiosks

Evolving from ATMs, kiosks offer a broader range of services, including money transfers, deposits, cheque cashing, loan applications, and printing statements/cheque books. In rural India, kiosks connect to control centres via mobile signals, promoting financial inclusion for those in remote areas.

Mobile Banking and M-PESA

M-PESA in Kenya demonstrates that mobile banking does not require a smartphone. It allows users to send airtime credit via text, which is then cashed at convenience stores. It effectively turns a SIM card into a debit card. According to Suri \& Jack ( $2016$ ), it helped lift an estimated $2\%$ of Kenyan households out of poverty.

Web-Based Interfaces

Platforms like digital voice assistants and mobile apps allow banks to reach beyond branch networks. These rely on two technologies:

Cloud Computing: Facilitates AI-based data processing for personalization.
APIs (Application Programming Interfaces): Enable secure data sharing between legacy and new systems.

Comprehensive Back-Office Frameworks

Accounting Systems

These are databases tracking transactions ( $money in$ as credits and $money out$ as debits) and account balances. They record payment types (direct debits, standing orders) for customer reconciliation and provide an aggregated view of the bank's financial position for governance and regulatory reporting.

Processing Systems

Focused on supporting payments, these systems must communicate with the accounting system to track the bank's daily liquidity position (cash position). This allows the bank to lend excess cash to earn interest. They translate data from various sources into a single interoperable language.

Point-of-Sale (POS) Systems

Used by merchants to accept card or mobile wallet payments. The equipment is often leased from banks, electronic money institutions (EMIs), or merchant acquirers. Key parties in a digital payment journey include the customer (payer), merchant (payee), and their respective banks, along with card providers and merchant acquirers. POS providers charge merchants a flat or percentage-based fee.

Customer Relationship Management (CRM) Systems

These hold searchable, text-based customer records. Information includes name, address, ID documents, preferences, and card details. This data helps in product development and targeted, personalized marketing.

Global, Regional, and National Networking Systems

Global Systems

SWIFT: The Society for Worldwide International Financial Transactions, founded in $1973$ , allows banks to send money cross-border via a cooperative network. Senders input details in a required format; SWIFT authenticates the payment and requests funds transfer for a fee.

Regional and National Systems

SEPA: The Single Euro Payments Area covers digital Euro payments. It includes non-EU members like the UK.
CHAPS: The Clearing House Automated Payments System is used in the UK for high-value, same-day transfers (e.g., house purchases).
BACS: The Bankers Automated Clearing System handles smaller UK payments (salaries, standing orders) on a $3$ -day cycle.
UPI: India's Universal Payments Interface allows real-time, mobile-accessible payments even on non-touchscreen phones.

Card-Based Systems

Visa and Mastercard act as global middlemen for smaller payments. Originally paper-based, they now facilitate almost entirely digital credit and debit card transactions worldwide.

Electronic Money Institutions (EMIs)

EMIs like PayPal assist in digital transactions, acting as intermediaries between banks. User funds in EMIs are typically stored in third-party bank accounts. In the EU, EMIs can access user bank accounts with consent. PayPal earns money via business account fees and currency conversion; customer balances are held on trust and cannot be lent out by PayPal.

Digital Payment Products and Plastic Card Technology

History and Card Types

Charge Card: First issued by American Express in $1959$ . Must be repaid in full each month.
Credit Card: Barclaycard introduced in the UK in $1966$ . Allows borrowing up to a limit with a variable monthly repayment above a minimum.
Debit Card: Introduced in the $1980s$ . Spends funds directly from a linked bank account.

Underlying Technologies

Magnetic Stripe: Authenticated by swiping and manual signature matching.
Chip and PIN: Uses a small square chip and a Personal Identification Number.
NFC: Near Field Communication allows contactless payments by holding the card near a reader.

Multi-Currency and Prepaid Cards

Multi-currency cards allow users to hold different currency "pots" (e.g., USD, EUR, GBP) on one card, avoiding conversion fees. Prepaid (stored-value) cards do not require a credit facility or a linked bank account. They carry no credit risk and are used to build credit scores by recording repayment habits. In India, HDFC Bank offers prepaid cards for retail and ATM use.

Global File Transfer and Settlement Systems

Banks use systems like SWIFT's FileAct to transfer bulk data, operational information, and ownership documents (e.g., land deeds for mortgages).

Securities Settlement

CREST: Settles UK trades in equities and bonds.
LCH: The London Clearing House settles commodity-based derivatives.
AusPayNet: Handles the majority of interbank clearing in Australia, including cheques, ATMs, and high-value payments.

These systems depend on APIs for secure, automated, and encrypted data transmission.

Blockchain and Distributed Ledger Technology

A blockchain is an electronic ledger stored on a network of computers across multiple locations. It is also known as Distributed Ledger Technology (DLT).

Key Features of Blockchain Networks

Public and Private Keys: Analogous to email addresses and passwords. The private key authorizes sending, while the public key (address) allows receiving.
Digital Signatures: Generated with a private key to authenticate transactions without revealing the key. This increases transparency.
Immutability: Transactions are permanent on decentralized systems and cannot be reversed by a central authority.
Miners: Computers that maintain the ledger, verify logs, and are rewarded with tokens or fees. They consume hardware and energy for financial gain.
Provenance: Public transaction histories allow users to track the origin of any token or piece of information.
Decentralization: Open-source systems incentivize miners to support rather than undermine the network. Increased miner counts make collusion more difficult.

Applications in Banking

Cryptocurrency: Bitcoin ( $launched in 2009$ ) allows global token transfers.
Crypto Assets: Includes utility tokens and contractual rights. Hong Kong launched a blockchain-based bond in $2023$ .
NFTs (Non-Fungible Tokens): Blockchain tokens containing digital files. The Royal Mint is experimenting with NFTs to sell rights to commemorative coins without physical storage costs for the investor.
Smart Contracts: Software that executes when terms are met (e.g., a vending machine). In trade finance, they confirm goods arrival and trigger immediate payments.

Trade Finance and the Contour Network

Citigroup and Maersk have used blockchain to digitize bank guarantees. Traditional letters of credit require days of paperwork to ensure exporters get paid. Using the private Contour network (composed of $17$ global banks), Citi India reduced letter of credit issuance from $5-10$ days to under $3$ hours.

Mining and Reconciliation Mechanisms

Proof-of-Work (PoW)

Used by "permissionless" networks like Bitcoin. Miners compete to find a random number, proving effort via high computing power. Winners add a block and earn rewards.

Proof-of-Stake (PoS)

Miners "stake" their own tokens to earn the right to add blocks. Fraud attempts devalue their own holdings, providing an incentive for validity.

Trust-Based Systems

"Permissioned" or private systems rely on trusted institutional participants (e.g., banks), removing the energy-intensive reconciliation requirements of PoW.

Central Bank Digital Currencies (CBDCs)

Fiat currency is legal tender backed by law rather than gold. Currently, $90\%$ of money is digital. CBDCs are digitized fiat currency representing a direct claim on a central bank. Experiments by the central banks of France, Singapore, and Switzerland use blockchain tokens for wholesale cross-border settlement. CBDCs can be "programmable," allowing authorities to restrict spending on specific items like alcohol or cigarettes.

Digital Banking and Sustainability

Environmental Impact

There are approximately $400-500$ million cryptocurrency users. Bitcoin consumes more energy than Argentina (a nation of $45$ million people). Cloud computing has a higher carbon footprint than the airline industry. Data centres further consume large amounts of water and minerals.

Banking Impacts and Initiatives

Direct Impacts: Operations like office heating and branch lighting.
Financed (Indirect) Impacts: Lending and investment decisions. Between $2016$ and $2022$ , the largest $60$ banks financed $US\$5.5$ trillion toward fossil fuels.
Principles for Responsible Banking (PRB): Created by UNEP FI; including over $300$ signatories representing half the global industry.
Net-Zero Banking Alliance (NZBA): Over $130$ banks committed to net-zero carbon by $2050$ and limiting warming to $1.5^\circ C$ .
Kunming-Montreal Global Biodiversity Framework (GBF): Aims to protect ecosystems and close the $US\$700$ billion annual finance gap for biodiversity.

Sustainability Risks

Physical Risks: Natural hazards damaging branches or data centres.
Transition Risks: Obsolete carbon-intensive assets due to regulation or shifting consumer sentiment.
Liability Risks: Compensation claims for damages (e.g., BNP Paribas being taken to court by campaigners).

Pathways to Sustainability

Digitization reduces paper and travel, while advanced analytics prevent wasteful "blanket" marketing. Tandem Bank provides energy-efficiency loans, and the startup Tred allows customers to track and offset the carbon footprint of their spending.

Impact of Digital Systems on Competition

Unbundling

Historically, banks used "bundling" (e.g., free insurance with fee-paying accounts) to maximize per-customer revenue. Digital interfaces and price comparison sites have led to "unbundling," where customers switch easily for better deals, reducing loyalty and pressuring profit margins.

Lowered Barriers to Entry

Branding: Reputational damage from the $2008$ crisis made consumers more open to alternatives.
Distribution: Branches are no longer required due to web interfaces and cloud computing.
Regulation: Regulators have relaxed rules for smaller firms to foster innovation and spread systemic risk.
Financing: Low global interest rates from the $1980s$ to $2021$ provided ample capital for fintech start-ups.

Non-Bank Financing

P2P Lenders: Online platforms connecting savers and borrowers without holding the loans or taking credit risk. They earn fee income rather than interest.
Crowdfunding: Facilitates equity (shares) or charity-based transactions directly between financiers and projects.

Strategic Responses by Banks

Banks adapt through:

Cooperation and Investment: Outright takeovers or partnerships. JP Morgan spends $US\$12$ billion annually on internal technology while investing in startups.
Banking as a Platform (BaaP): Distributing third-party products via a digital marketplace, as seen with Starling Bank.
Banking as a Service (BaaS): "White labelling" services for retailers, such as HSBC operating M\&S Bank for the department store Marks \& Spencer.