Mobile, Instant and Cross-Border Payments

Introduction and context

Payment systems are the infrastructure through which value moves between a payer and a payee. They include customer-facing instruments—such as mobile wallets, cards and QR codes—and institutional arrangements, including payment switches, clearing systems, settlement accounts and correspondent banks. Digitalisation has made payments faster and more accessible, but it has not removed the underlying requirements of trust, liquidity, identity, compliance and final settlement.

This chapter examines six closely related payment models: mobile wallets, QR payments, account-to-account transfers, real-time payment rails, remittances and correspondent banking. It also evaluates the practical dimensions that determine payment quality: speed, cost, foreign exchange, interoperability, security, consumer protection and cross-border modernisation.

Learning objectives

By the end of this chapter, a learner should be able to:

1. Distinguish mobile wallets, QR payments, account-to-account transfers and real-time payment rails.
2. Explain how domestic and cross-border payments are cleared and settled.
3. Compare remittance channels and correspondent banking arrangements.
4. Calculate the basic cost and recipient value of a foreign-currency transfer.
5. Assess interoperability, foreign exchange, speed, fees and operational risk.
6. Identify regulatory, ethical and governance requirements for digital payments.
7. Recommend an appropriate payment method for a practical banking scenario.

1. The payment transaction chain

A payment normally involves five stages:

1. Initiation: The payer gives an instruction through an app, wallet, card, web channel or agent.
2. Authentication and authorisation: The provider verifies the user and confirms that the transaction may proceed.
3. Routing and clearing: Payment information is sent to the relevant bank, wallet provider, switch or scheme. Clearing determines obligations between participants.
4. Settlement: Funds are transferred between settlement accounts. Settlement may occur immediately or in batches.
5. Reconciliation and exception handling: Participants match records, investigate failed payments and manage refunds, disputes and fraud alerts.

Clearing and settlement should not be confused. A payment message can be accepted immediately while the actual inter-institution transfer occurs later. In a real-time payment system, clearing and settlement may both occur within seconds, although the precise legal and technical arrangements differ between countries.

Figure: A simplified payment transaction chain. A payment message is not necessarily identical to final settlement.

2. Mobile wallets and QR payments

A mobile wallet is a digital account or application that stores value, payment credentials or tokens and enables transactions through a mobile device. Wallets may be:

• Stored-value wallets, where a balance is maintained by a regulated issuer or electronic-money institution.
• Pass-through wallets, which tokenise or access a bank account or card without holding customer funds themselves.
• Closed-loop wallets, accepted only within a particular merchant or platform.
• Open or interoperable wallets, connected to multiple merchants, banks or payment schemes.

A wallet may support person-to-person transfers, merchant payments, bill payments, transport fares and international remittances. Its convenience depends on mobile connectivity, device security, agent availability and the ability to convert cash into electronic value.

A QR payment uses a two-dimensional code containing payment information. In a merchant-presented transaction, the merchant displays a code and the customer scans it. In a customer-presented transaction, the customer displays a code that the merchant scans. The code may be static, requiring the payer to enter the amount, or dynamic, containing a transaction-specific amount and reference.

QR technology is only an initiation method; it is not itself a settlement rail. The underlying payment may use a wallet ledger, card network, bank transfer or instant-payment system. This distinction is important when comparing security, reversibility, fees and settlement speed.

QR payments reduce hardware costs and can assist small merchants. However, static QR codes create risks of substitution or social engineering, while fragmented proprietary QR schemes may prevent acceptance across providers. Strong merchant verification, transaction confirmation, limits and dispute procedures are therefore essential.

3. Account-to-account transfers and instant payment rails

An account-to-account (A2A) transfer moves funds directly from a payer’s bank or wallet account to a payee’s account, without necessarily using a card network. It may be initiated through online banking, a mobile application, a QR code or an alias such as a phone number.

A real-time payment (RTP) rail is an infrastructure that processes payment instructions continuously or near-continuously and provides rapid confirmation. Important characteristics include:

• 24-hour or extended availability;
• immediate or near-immediate confirmation;
• irrevocable or highly restricted cancellation after acceptance;
• automated fraud and sanctions controls;
• directory services for aliases or proxy identifiers;
• rules for liquidity, dispute management and participant access.

“Instant” can refer to customer-facing confirmation, clearing, settlement or all three. A bank may display a successful message while a beneficiary’s funds remain subject to risk controls or account posting. Banks should state clearly what instant means in their product terms.

A useful comparison is shown below.

4. Domestic versus cross-border payments

Domestic payments generally operate under one currency, one legal system and a common set of payment rules. Cross-border payments add several layers of complexity:

• different currencies and foreign-exchange markets;
• separate legal and regulatory jurisdictions;
• sanctions and anti-money-laundering obligations;
• different operating hours and holidays;
• multiple intermediaries and settlement accounts;
• inconsistent data standards and consumer protections;
• exchange-rate and liquidity risk.

A cross-border payment can therefore be fast at the messaging level but slow at the funds level. It may pass through correspondent banks, regional payment systems, money-transfer operators, card networks or linked instant-payment schemes.

Foreign exchange and recipient value

Suppose a customer sends an amount in currency A and the beneficiary receives currency B. A simplified recipient-value model is:

where:

• R = amount received in currency B;
• P = principal sent in currency A;
• F_s = sending fee in currency A;
• r = quoted exchange rate, expressed as units of B per unit of A;
• s = proportional foreign-exchange spread, written as a decimal.

This formula assumes that the sending fee is deducted before conversion, that the spread is applied proportionally, and that there are no additional intermediary or receiving fees. If a receiving fee F_r is charged in currency B, then:

The formula is a simplified pricing tool, not a universal settlement identity. Actual providers may apply a separate fixed fee, a tiered price, a buy or sell rate, taxes, or an intermediary deduction.

Worked example. A customer sends 500 units of currency A. The sending fee is 5 units. The quoted rate is 1.20 units of B per unit of A, the foreign-exchange spread is 2%, and the receiving fee is 3 units of B.

R_net = (500 − 5) × 1.20 × (1 − 0.02) − 3

R_net = 495 × 1.20 × 0.98 − 3 = 582.12 − 3 = 579.12

The beneficiary receives 579.12 units of currency B under the stated assumptions. The effective cost should be assessed using the total reduction in recipient value, not merely the advertised sending fee.

A useful effective-cost measure, when the benchmark rate is known, is:

where r_b is a transparent benchmark exchange rate in units of B per unit of A. This measure combines explicit fees and exchange-rate margin. It is meaningful only when the benchmark rate, timing and currency conventions are comparable.

5. Remittances

A remittance is a transfer of money by an individual, commonly a migrant worker, to a person or household in another country. Remittances can be sent through banks, money-transfer operators, mobile-money corridors, card-based services, digital platforms or informal channels.

The remittance customer values more than price. Relevant dimensions include:

1. Total cost: explicit fee plus exchange-rate margin and possible receiving charges.
2. Speed: time to availability, not merely time to initiation.
3. Reach: whether the recipient has a bank account, wallet, identity document or nearby agent.
4. Reliability: probability of successful completion and quality of exception handling.
5. Transparency: clarity about fees, rate, delivery time and cancellation.
6. Safety: protection against fraud, coercion, theft and unauthorised access.

Digital remittances can lower distribution costs and improve traceability, but they can exclude people with limited connectivity, low digital literacy or no acceptable identity document. Cash-out fees may also make a supposedly low-cost transfer expensive in practice.

Banks and money-transfer providers must apply customer due diligence, transaction monitoring, sanctions screening and suspicious-transaction reporting in accordance with applicable law. Controls should be risk-based: excessively broad restrictions can deny legitimate migrants access to essential family support, while weak controls expose the system to criminal abuse.

6. Correspondent banking

Correspondent banking is an arrangement in which one bank provides payment, settlement or account services to another bank, often in a different country or currency. The respondent bank may use the correspondent’s account to access the correspondent’s domestic payment system.

Common account relationships include:

• Nostro account: an account held by a bank with another bank, usually in a foreign currency.
• Vostro account: the same account viewed from the perspective of the bank holding it on behalf of another institution.
• Cover payment: a structure in which payment information and the funds-transfer instruction travel through different channels or intermediaries.

A typical correspondent transaction may involve the remitting bank, one or more correspondent banks, a beneficiary bank and local clearing infrastructure. Each additional intermediary can add fees, processing time, data requirements and operational risk. Banks must maintain sufficient liquidity in relevant nostro accounts and reconcile expected and actual balances.

Correspondent banking remains important because it connects currencies and jurisdictions that do not share a common retail payment rail. However, some banks have reduced correspondent relationships because of compliance costs, sanctions exposure, legal uncertainty and low profitability. This process, often called de-risking, can unintentionally push customers toward less transparent channels.

7. Interoperability and cross-border modernisation

Interoperability is the ability of different payment providers, schemes or infrastructures to exchange messages and settle obligations effectively. It may be achieved through:

• a common national switch;
• bilateral connections between providers;
• multilateral regional schemes;
• linked fast-payment systems;
• common QR specifications;
• standardised application programming interfaces;
• harmonised legal and operational rules.

Interoperability has technical, commercial and regulatory dimensions. A technically connected system may still be commercially inaccessible if providers impose incompatible fees or restrictive rules. Similarly, a common message format does not guarantee consumer protection or final settlement.

Cross-border modernisation commonly pursues four improvements:

1. Common data standards: structured payer and beneficiary information reduces manual repair and errors.
2. Better transparency: customers see the total fee, exchange rate and expected delivery time before authorising.
3. Direct or linked access: fewer unnecessary intermediaries reduce cost and delay.
4. Faster compliance decisions: automated screening and risk-based controls reduce avoidable holds while preserving safeguards.

International message standards such as ISO 20022 can carry richer structured data, but implementation quality matters more than the label. Institutions must map data accurately, protect privacy and ensure that legacy systems do not truncate essential information.

8. Risk, regulation and governance

Digital payment risk can be grouped into several categories:

Strong customer authentication may combine knowledge, possession and inherence factors, but authentication alone does not prevent a customer from being deceived into authorising a payment. Confirmation of payee, transaction limits, cooling-off periods for unusual activity and rapid recall procedures can reduce authorised fraud.

The principle of finality is central. Once a payment is legally final, reversing it may require the beneficiary’s cooperation or a formal recovery process. Customer interfaces should therefore distinguish pending, accepted, settled, rejected and reversed states.

Regulators typically address licensing, safeguarding of customer funds, capital or liquidity, operational resilience, outsourcing, data protection, consumer disclosure, anti-money-laundering controls and systemic oversight. Providers should also consider accessibility for persons with disabilities, language differences and customers who cannot use smartphones.

9. Selecting a payment method: a professional framework

A bank or business should not select a channel solely because it is the fastest. A practical assessment asks:

• Who are the payer and payee, and what access do they have?
• Is the payment domestic or cross-border?
• What currency conversion is required?
• Is immediate finality necessary, or is low cost more important?
• What is the total cost to the payer and recipient?
• Can both parties use interoperable infrastructure?
• What fraud, sanctions and privacy risks are present?
• What happens if the transaction fails or is sent to the wrong account?
• Are records sufficient for reconciliation, audit and dispute resolution?

For a small domestic merchant, an interoperable QR payment linked to an instant A2A rail may be appropriate. For a high-value corporate transfer, a bank channel with robust beneficiary verification, documented purpose and controlled settlement may be preferable. For a migrant sending a modest amount to a rural household, a wallet or agent-supported remittance service may provide better reach than a conventional bank transfer.

10. Illustrative case: Meridian Bank’s regional remittance corridor

Background

Meridian Bank operates in Country A and serves migrant workers sending money to Country B. Its traditional correspondent-banking route takes two business days. Customers complain that the advertised fee does not reflect intermediary deductions and that beneficiaries receive less than expected.

Problem

The bank must reduce delivery time and improve transparency without weakening sanctions screening, fraud controls or access for recipients without bank accounts.

Analysis

The existing process uses a correspondent bank in a major currency. It involves manual repair of incomplete beneficiary data, a foreign-exchange spread and a cash-out charge in Country B. The bank’s management compares three options:

Approach and solution

Meridian chooses a phased model. It connects its mobile channel to the regional payment scheme for eligible low-value transfers and creates a regulated wallet partnership for recipients without bank accounts. Before authorisation, the customer sees the sending fee, exchange rate, estimated recipient amount and possible cash-out charge. The system validates the beneficiary name, screens the transaction and applies limits based on risk.

The bank establishes prefunded settlement arrangements, daily reconciliation, exception queues and a service-level agreement with the wallet provider. It also retains the correspondent route for currencies and transaction types not supported by the regional scheme.

Outcome

The new service provides faster availability for eligible transactions and improves price comparison. However, the bank discovers that instant processing increases fraud attempts because criminals exploit the difficulty of reversing settled payments. It therefore adds stronger warnings, confirmation of payee and delayed release for unusual transactions.

Learning points

1. Modernisation is a combination of infrastructure, data, liquidity, compliance and customer design.
2. A low advertised fee does not prove a low total cost.
3. Interoperability expands reach only when commercial and regulatory rules also align.
4. Faster settlement increases the importance of prevention and exception management.
5. Hybrid models are often more practical than replacing correspondent banking completely.

11. Contemporary developments and best practices

Financial institutions increasingly use application programming interfaces, cloud infrastructure, tokenisation, biometric authentication and machine-learning models for fraud detection. AI can identify unusual transaction patterns, prioritise alerts and support customer service. It must not be treated as infallible: biased training data, explainability problems, privacy concerns and adversarial manipulation require human oversight and model governance.

Best practices include:

• display total price, exchange rate and estimated recipient value before consent;
• use confirmation of payee and carefully designed warnings;
• separate transaction initiation from high-risk administrative functions;
• apply risk-based, explainable monitoring;
• maintain tested business-continuity and cyber-incident plans;
• reconcile payment messages, ledger entries and settlement accounts daily;
• provide accessible complaints, refunds and unauthorised-transaction procedures;
• test interoperability using realistic failure and dispute scenarios;
• monitor inclusion outcomes, not only transaction volume;
• review third-party and correspondent dependencies regularly.

Chapter Summary

Mobile wallets store or access digital value, while QR codes provide a convenient method of initiating transactions. Account-to-account transfers move funds directly between accounts, and real-time payment rails provide rapid processing and confirmation. These instruments depend on underlying clearing and settlement arrangements.

Cross-border payments are more complex because they involve multiple currencies, jurisdictions, operating schedules, intermediaries and compliance obligations. Remittance evaluation must include total cost, exchange-rate margin, speed, reach, reliability and safety. Correspondent banks remain important for connecting currencies and payment systems, although they can increase cost and operational complexity.

Interoperability, structured data, linked instant-payment systems and transparent pricing can modernise cross-border payments. Nevertheless, faster payments also increase fraud and irrevocability risks. Effective governance requires authentication, sanctions screening, privacy protection, operational resilience, reconciliation, consumer disclosure and meaningful redress. Professional payment design balances speed and convenience with finality, safety, inclusion and regulatory accountability.

Key Terms

Mobile wallet: A digital application or account that stores value or payment credentials and enables mobile transactions.

QR payment: A payment initiated by scanning or displaying a two-dimensional quick-response code.

Account-to-account transfer: A transfer made directly between payer and payee accounts.

Real-time payment rail: Infrastructure that processes payment instructions continuously or near-continuously with rapid confirmation.

Clearing: The exchange and processing of payment information and calculation of obligations.

Settlement: The discharge of obligations through transfer of funds between settlement accounts.

Interoperability: The ability of different payment systems or providers to work together effectively.

Remittance: A transfer, commonly cross-border, made by an individual to another person or household.

Correspondent banking: Banking services provided by one bank to another, often across jurisdictions.

Nostro account: An account held by a bank with another bank, generally in a foreign currency.

Vostro account: A correspondent account viewed from the perspective of the bank holding it.

Foreign-exchange spread: The margin between a provider’s exchange rate and a relevant benchmark or market rate.

Payment finality: The point at which a payment becomes legally and operationally settled and normally irrevocable.

Customer due diligence: Procedures used to identify and assess customers and their risks.

Sanctions screening: Checking parties and transactions against applicable sanctions lists and rules.

Prefunding: Placing funds in advance to support settlement obligations.

Confirmation of payee: A service that checks whether account details correspond to the intended beneficiary.

De-risking: Withdrawal or limitation of financial relationships because perceived compliance or operational risk is too high.

Review Questions

Short Answer Questions

1. What is the difference between clearing and settlement?
2. How does a QR payment differ from a payment rail?
3. State two advantages and two risks of mobile wallets.
4. What is a correspondent bank?
5. Why can the advertised fee for a remittance understate its true cost?

Long Answer Questions

1. Compare mobile wallets, QR payments, A2A transfers and real-time payment rails.
2. Explain the operational stages of a cross-border payment.
3. Discuss the role of interoperability in reducing payment cost and delay.
4. Explain why correspondent banking remains important despite the growth of instant-payment systems.
5. Evaluate the regulatory and consumer-protection issues associated with instant payments.

Analytical / Application Questions

1. A customer sends 800 units of currency A. The sending fee is 8 units, the rate is 1.25 units of currency B per unit of A, the FX spread is 1.5%, and the receiving fee is 4 units of B. Calculate the net amount received using the model in this chapter and explain its assumptions.
2. A rural recipient has a basic mobile phone, no bank account and limited internet access. Recommend a suitable remittance channel and justify the choice using reach, cost, speed, security and cash-out considerations.
3. A bank is deciding whether to replace its correspondent route with a regional instant-payment connection. Prepare a recommendation that considers liquidity, compliance, interoperability, fraud, finality, customer transparency and business continuity.

Multiple Choice Questions with Answers

Question 1

Which statement best distinguishes a QR payment from a payment rail?

A. A QR payment is always a stored-value wallet.

B. A QR payment is an initiation method that may use different underlying rails.

C. A QR payment settles only through correspondent banks.

D. A QR payment is legally identical to a card transaction.

Correct Answer: B. A QR payment is an initiation method that may use different underlying rails.

Question 2

Which stage determines the obligations between payment participants?

A. Initiation

B. Authentication

C. Clearing

D. Complaint handling

Correct Answer: C. Clearing

Question 3

A customer sends 500 units of currency A, pays a 5-unit fee, receives an exchange rate of 1.20 B per A, and faces a 2% FX spread. Ignoring receiving fees, how much is received?

A. 582.12 units of B

B. 594.00 units of B

C. 600.00 units of B

D. 485.20 units of B

Correct Answer: A. 582.12 units of B

Question 4

What is a major characteristic of a real-time payment rail?

A. It processes only during monthly batch windows.

B. It provides rapid processing and confirmation, subject to the system’s rules.

C. It eliminates the need for authentication.

D. It guarantees that every payment can be reversed.

Correct Answer: B. It provides rapid processing and confirmation, subject to the system’s rules.

Question 5

Which factor is most directly associated with correspondent banking?

A. A bank providing settlement or payment services to another bank

B. A merchant displaying a static QR code

C. A customer storing a password offline

D. A central bank issuing a credit card

Correct Answer: A. A bank providing settlement or payment services to another bank

Question 6

Why may a cross-border transfer cost more than its advertised sending fee?

A. Because all transfers are tax-free but slower

B. Because exchange-rate margins, intermediary charges and receiving fees may apply

C. Because QR codes automatically add a fee

D. Because settlement always occurs twice

Correct Answer: B. Because exchange-rate margins, intermediary charges and receiving fees may apply

Question 7

Which control is particularly useful against sending funds to the wrong beneficiary?

A. Confirmation of payee

B. A higher exchange-rate spread

C. Removing transaction records

D. Disabling reconciliation

Correct Answer: A. Confirmation of payee

Question 8

What does interoperability mean in payment systems?

A. One provider controls every payment account

B. Different systems or providers can exchange messages and settle effectively

C. All payments use one currency

D. Customers never need identity checks

Correct Answer: B. Different systems or providers can exchange messages and settle effectively

Question 9

Why can instant payments increase operational risk?

A. They make all transactions anonymous.

B. They reduce the need for payment infrastructure.

C. Fast or final settlement leaves less time to detect and reverse fraud.

D. They prevent banks from monitoring transactions.

Correct Answer: C. Fast or final settlement leaves less time to detect and reverse fraud.

Question 10

Which item is a nostro account?

A. An account held by a bank with another bank, often in a foreign currency

B. A customer’s mobile-phone contact list

C. A merchant’s QR display

D. A sanctions-screening report

Correct Answer: A. An account held by a bank with another bank, often in a foreign currency