Payment Security Best Practices: How to Safeguard Transactions in 2026

From April 1, 2026, every digital payment in India must use two-factor authentication with at least one dynamic factor, marking the most significant overhaul to India’s payment security framework in years. This mandate from the Reserve Bank of India (RBI) signals a new era of payment security, one that Indian businesses can no longer afford to ignore.

Businesses in 2025 are operating completely online, from listing their services to making transactions. This digital environment is prone to a lot of security risks, and having strong payment security practices in place can help protect you from them.

Since India’s digital payments landscape is expanding rapidly, so is its fraud exposure. Key statistics paint a clear picture:

• Tokenized transactions show 30% lower online fraud and approximately 4-6% higher approval rates compared to non-tokenized transactions.
• UPI fraud jumped 85% in FY24 and continued at elevated levels through 2025.
• The payment security market in Asia-Pacific is growing at a CAGR of 17.5% through 2032.

Here, we will discuss what payment security is, why it is important, what risks you need to watch out for, and the best security practices you can follow. We'll also cover how partnering with a payment platform like Xflow can boost your business operations while keeping your data safe.

Payment security is the tools and techniques used to keep digital transactions safe. These measures protect transaction and payment information from fraud, unauthorized access, data breaches, and privacy breaches.

Payment security covers the processes, systems, and tools that protect payment information throughout its lifecycle. When your customers make transactions online, they’re revealing a lot of private payment data. Your business is storing it along with all your transaction records. This information has to be protected from fraud and data breaches.

The most common online payment security methods that are used today, like encryption, firewalls, tokenization, authentication, and regulatory compliance, can help you safeguard sensitive data.

In India, payment security is governed by a layered regulatory framework:

• RBI Authentication Directions 2025: Mandatory two-factor authentication (2FA) from April 1, 2026, with at least one dynamic factor for card-not-present (CNP) transactions.
• Digital Personal Data Protection (DPDP) Act 2023: India’s first comprehensive data privacy law, governing payment data privacy and breach notification.
• PCI DSS v4.0.1: The current global standard for card data security, fully mandatory since March 2025.

RBI PA-CB guidelines: Regulations for cross-border payment processors operating in India.

Businesses that use different types of online payments might have a lot of third-party software in place, which can add vulnerabilities. Malware attacks might occur on digital devices being used for payments. Phishing and data theft risks are also common.

Third-party risks

When you are managing your payment operations, using third-party vendors can be risky. They may not be as transparent about their security measures. If you’re planning on using a third-party software, then try to evaluate the provider for their security control practices. Otherwise, you run the risk of a data breach and exposure.

Malware risks

Malware is software that can allow hackers to access sensitive data. Malware attacks are common on mobile devices, tablets, and other point-of-sale systems, which can leak this sensitive payment data to hackers. This could damage your business’s reputation and compromise your operations.

Phishing risks

Phishing risks have become much more common today. Users tend to receive emails or messages that seem to come from trusted banks or financial institutions, but are not actually trustworthy. They then ask users to send personal or financial details, which can lead to fraud.

SIM-swap fraud

A fraudster tricks a telecom operator into porting a victim’s mobile number to a SIM card they control, intercepting all OTPs sent to that number. SIM-swap fraud cost victims approximately USD 50 million in 2023 globally and is a primary driver of India’s move beyond SMS-OTP authentication. The RBI’s 2025 directions directly address this by requiring dynamic, transaction-specific factors.

AePS biometric cloning

Fraudsters use silicon molds of cloned fingerprints to authorize Aadhaar-enabled Payment System (AePS) withdrawals. Approximately 29,000 AePS fraud incidents were reported on India’s NCRP platform. The RBI’s new authentication directions include biometric standards specifically designed to counter this threat.

Business Email Compromise (BEC)

For exporters, fraudsters intercept email threads and substitute fraudulent bank account details on invoices or payment instructions. BEC was the most common payment fraud method in 2024, with adjusted losses exceeding USD 2.7 billion in the US alone. BEC attacks increased by a further 15% in 2025. This is a critical threat for Indian IT exporters and freelancers.

Different types of payment security can be used to mitigate risks of fraud and data breaches. These include tokenization, encryption, authentication, fraud detection tools, PCI DSS compliance, and network security controls.

Encryption

Encryption uses algorithms to scramble data into an unreadable format. A special key is required to restore it. Modern implementations use Transport Layer Security (TLS) to do this. Here’s what you need to know:

• TLS 1.0 and 1.1 are deprecated and prohibited under PCI DSS v4.0.
• TLS v1.2 is the current minimum requirement; TLS v1.3 is recommended for new implementations.
• Point-to-Point Encryption (P2PE) encrypts data from the point of capture, meaning it is unreadable throughout the transaction path, significantly reducing PCI DSS scope for merchants.

Tokenization

Tokenization replaces sensitive payment data with a random token stored in a secure vault. In a data breach, stolen tokens cannot be traced back to the original information without the issuing network’s keys.

Visa reports that tokenized eCommerce transactions see a 30% reduction in fraud compared to PAN-based transactions, along with a 4-6% uplift in authorisation rates. This makes tokenization one of the highest-ROI payment security investments available.

Authentication

Authentication verifies that the person initiating a payment is authorised to do so. Methods include CVV codes, one-time passwords (OTPs), two-factor authentication (2FA), multi-factor authentication (MFA), biometrics, and device-bound tokens.

As per RBI Authentication Directions, 2025 (effective April 1, 2026), all digital payments in India must use at least two distinct authentication factors. For card-not-present (CNP) transactions, at least one factor must be dynamic, unique to each transaction. Static passwords alone no longer qualify.

Additional updates:

• 3-D Secure 2 (3DS2 / EMV 3DS v2.x): This is the current standard. Unlike the original 3DS, it supports risk-based authentication, reducing unnecessary friction for low-risk transactions.
• Passkeys (FIDO2): This is an emerging phishing-resistant standard where the private key never leaves the device. Passkeys eliminate SIM-swap and OTP interception risks entirely. The RBI’s 2025 directions explicitly support device-bound tokens and biometrics as qualifying authentication factors.

Fraud detection

Fraud detection systems analyse payment activity to spot unusual patterns in real time. Key components include:

• AI-driven monitoring: It uses machine learning to analyse historical data and detect anomalies more efficiently than rule-based systems.
• 3DS2 risk-based authentication: It adds contextual verification steps only when transaction risk warrants it.
• IP and proxy detection: It identifies if users are masking their location via VPNs or proxies.
• DMARC, SPF, and DKIM: These are email authentication protocols that prevent domain spoofing, which is a key enabler of BEC attacks. These are now formally required under PCI DSS.

PCI DSS compliance

The Payment Card Industry Data Security Standard (PCI DSS) sets rules for handling card-based payment data. Here are the compliance requirements that you must know:

• MFA is required for all access to the Cardholder Data Environment (CDE).
• The minimum password length is 12 characters.
• Mandatory monitoring and integrity checks are needed for all scripts on payment pages.
• Targeted Risk Analysis (TRA) has replaced annual-only scanning with continuous monitoring.
• DMARC, SPF, and DKIM are now required for payment email channel security.

PCI DSS v3.2.1 vs v4.0.1: Key Changes at a Glance

Network security controls

Network security controls decide what data can enter or leave a network.

Note: PCI DSS v4.0 updated terminology from ‘firewall’ to ‘network security controls’ to accommodate cloud-native and software-defined networking (SDN) environments.

Network segmentation is now explicitly required. Isolating the Cardholder Data Environment from other networks reduces PCI DSS compliance scope and limits the blast radius of a breach.

Digital payments are convenient, but come with a lot of vulnerabilities. Collecting customer payment information and making cross-border payments can put you at risk of fraud and leakage of sensitive data, which can further lead to revenue loss, compliance issues, and reputational damage.

Protecting sensitive data

Your business is likely storing a lot of sensitive information – your customers’ card details, payment information, along with your own financial data. Strong online payment security methods have to be put in place to protect all this information.

Protecting against fraud

All payments that are happening online are more exposed to money laundering, identity theft, and fraud risks. A secure payment strategy will let you detect fraudulent transactions, protecting your business operations.

Protecting against revenue loss

If the sensitive data in your business ecosystem gets leaked, you will lose customer trust and revenue. Customers might file lawsuits, or you might run into fraudulent chargeback requests, which will lead to financial losses.

Compliance and reputation

Strong payment security allows you to meet industry requirements like PCI DSS v4.0.1, the RBI Authentication Directions 2025, and India’s DPDP Act 2023. Non-compliance carries serious consequences.

The Digital Personal Data Protection (DPDP) Act 2023 is India’s first comprehensive data privacy law and governs all digital personal data, including payment data. The DPDP Rules were notified on November 13, 2025 and are being implemented in phases (full compliance expected by May 2027). Key obligations for payment businesses:

• Explicit, informed consent is required before collecting payment data.
• Users have the right to access, correct, and erase their data.
• Mandatory breach notification to the Data Protection Board within 72 hours.
• Penalties up to ₹250 crore for serious violations.
• The RBI’s authentication directions explicitly require compliance with the DPDP Act.

Today, payment security tools and practices are used in many industries. E-commerce and online businesses, banking sectors, and fintech companies need to process and store payment information. They need to do this securely to ensure the trust of their customers and regulatory compliance.

E-commerce

Traders, freelancers, and online retailers are conducting all their business across the web. When using payment gateways for accepting payments, they must look for secure payment options, encryption, and other payment security types. These steps will keep customer data safe.

Banking

As banks and financial institutions move their operations online, customer data becomes more easily accessible. India’s RBI has been proactive in addressing this. The April 2026 authentication mandate formalises risk-based authentication across all payment system providers, making India’s framework among the most advanced globally.

Some foundational measures are using authentication, secure digital infrastructure and processes like KYC, PCI DSS, and GDPR, and monitoring all transactions using audit trails and dashboards. Banks can build on these payment security practices to preserve sensitive data.

FinTech

Fintechs provide core banking and financial services to people digitally. Because the industry changes and advances at a much faster pace, keeping strong payment security practices is critical.

Fintechs must stay compliant with the DPDP Act 2023, the RBI Authentication Directions 2025, and PCI DSS. Using fraud monitoring, threat intelligence, and tokenization tools when handling customer data, while keeping the users informed on the same, is another need of the hour. Without these security measures, fintechs risk losing their customers and revenue.

Cross-border payments and exporters

For Indian IT exporters, freelancers, and funded startups collecting international payments, cross-border payment security involves a distinct set of threats. BEC and invoice hijacking are the leading risks. Fraudsters intercept email threads with overseas clients and substitute their own bank account details.

Key security requirements for this use case include email authentication (SPF, DKIM, DMARC) to prevent domain spoofing, eFIRA generation for tamper-proof payment receipts, and routing payments through an RBI PA-CB authorised aggregator.

All scaling businesses need payment security measures that meet their needs. These payment security best practices, such as securing their business platform, utilizing available fraud detection tools, making informed choices about payment partners, and keeping both employees and customers informed, can significantly enhance the safety of online transactions.

Secure your platform

When setting up your business presence online, use a secure payment infrastructure that is designed to protect your operations against vulnerabilities. There are two simple things to do: keep all your software and plugins updated, and monitor your platform regularly for unusual activity.

Use fraud detection tools

Fraud detection systems can tackle the risks of fraud from different angles. They can spot unusual patterns with behavioral and predictive analysis, use machine learning to detect suspicious activity, apply role-based rules to block fake requests, and add biometric authentication checks to prevent fraud in the first place.

Implement risk-based authentication now

Ahead of the April 2026 RBI mandate, businesses should implement contextual transaction risk assessment. This involves evaluating device, location, transaction amount, and frequency to determine the appropriate level of authentication friction. This satisfies the RBI’s formal requirement and reduces customer friction on low-risk transactions.

Move beyond SMS OTP

Given the prevalence of SIM-swap fraud in India, businesses should start adopting device-bound tokens, biometrics, or passkeys as additional authentication factors. These are explicitly supported under the RBI’s 2025 directions and are more resistant to interception than SMS OTPs.

Comply with the DPDP Act 2023

Implement explicit, informed consent mechanisms for payment data collection. Maintain data deletion and erasure processes. Ensure your breach notification procedures can meet the 72-hour reporting requirement to the Data Protection Board.

Secure your payment APIs

Conduct regular penetration testing on payment APIs and webhooks. Enforce signed API requests. Validate all inputs to prevent injection attacks. PCI DSS now also explicitly requires web application and API security scanning.

Inform employees and customers

Your employees need to be aware of best security practices, too. Keep them updated on online transaction risks, new security policies, and system changes. Training them on your payment systems helps them serve customers better while staying alert to risks.

Likewise, try to keep your customers informed on the steps they can take to ensure payment security.

Choose the right online payment provider

When selecting a payment provider for your business, choose solutions that offer multiple layers of payment security. Choosing an end-to-end payment solution that deals with all the stages of the payment process can reduce the number of third parties that access your data.

Online transactions and cross-border payments can be risky. The best way to deal with these risks is to create a payment security strategy. It should cover all potential scenarios of a security breach. Here’s how to stay prepared:

Conduct assessment

Start by reviewing your payment infrastructure while asking questions about how sensitive information is being handled. The solutions and systems that you have in place might have some security vulnerabilities, like improper data storage or multiple third-party integrations. Flag these areas of improvement.

Stay compliant

Stay up-to-date on security regulations. Check if your operations and infrastructure are compliant with the PCI DSS, GDPR, and local data protection laws. For international businesses, multi-currency accounts come with their own set of regulations.

There might be industry-specific rules that you need to be aware of, too. Staying compliant is a strong payment security practice that can help you avoid hefty fines and penalties as well.

Develop policies

Next, establish policies for how your business will handle sensitive data, access controls, and employee training. These policies need to be well-documented and strongly enforced to be effective for payment security.

Use strong security measures

Check if you have the right toolkit for payment security. Encryption, tokenization, firewalls, and authentication are well-known and easy to implement. Only work with payment service providers that adhere to such security measures.

Monitor regularly

Payment security is an ongoing process. Under PCI DSS v4.0, Targeted Risk Analysis (TRA) has replaced annual-only monitoring. Businesses must continuously monitor and document the rationale for the frequency of each security control, based on assessed risk. This means annual audits alone are no longer sufficient.

Create contingency plans

Even the strongest systems can face unexpected threats. Have an incident response plan in place, and adjust your approach if needed.

On September 25, 2025, the Reserve Bank of India issued its most comprehensive digital payment authentication framework to date. Effective April 1, 2026, every digital payment processed in India must comply with these new rules:

Core requirement: mandatory 2FA with a dynamic factor

• All digital payment transactions must be authenticated using at least two distinct factors.
• For card-not-present (CNP) transactions (online card payments, net banking, wallet transfers), at least one factor must be dynamic: unique to each transaction (e.g., a transaction-specific OTP). Static passwords alone will no longer qualify.
• Card-present transactions (POS terminals) are exempt from the dynamic factor requirement.

Risk-based authentication: proportionate security

• Low-risk transactions (small amounts, familiar device, known location) may pass with minimal friction.
• High-risk transactions (new device, large amount, unusual pattern) trigger additional verification.
• Banks can use biometrics, device fingerprinting, cryptographic tokens, or in-app confirmations as qualifying factors.

Cross-border payments: October 2026 deadline

• Card issuers must validate authentication for non-recurring cross-border CNP transactions from October 1, 2026.
• Risk-based authentication must be applied to all cross-border CNP transactions by the same date.
• Card issuers must register Bank Identification Numbers (BINs) with global card networks.

Accountability: issuer liability for non-compliant authentication

If fraud occurs because an issuer’s authentication was non-compliant, the issuer, not the customer, is financially liable. All authentication mechanisms must also comply with the DPDP Act 2023 for data privacy.

What businesses should do now?

• Accepting online payments: Confirm your payment gateway is updating its systems for the April 2026 deadline.
• Fintech/payment aggregator/platform: Review all CNP authentication flows and verify dynamic factor support.

Card issuer: Ensure your systems support dynamic factors and risk-based transaction checks.

For businesses collecting payments from overseas clients, whether you are an IT exporter, a freelancer, or a funded startup, cross-border payment security involves a distinct set of threats that generic global guides do not address.

Cross-border specific threats

• Business Email Compromise (BEC): Fraudsters intercept your email thread with a client and substitute their own bank account details on an invoice. BEC was the most common payment fraud method in 2024, with losses exceeding USD 2.7 billion in the US alone. BEC emails increased by a further 15% in 2025.
• SWIFT fraud: Fraudulent instructions injected into SWIFT message chains to redirect international wire transfers. Most common in large institutional transactions.
• Incorrect beneficiary transfers: A client sends funds to the wrong account due to a SWIFT code error. Recovery of international wire transfers is extremely difficult once executed.
• Fake payment notifications: A fraudster sends a forged SWIFT confirmation before actual funds arrive, prompting premature delivery of goods or services.

How Xflow addresses cross-border payment security

• RBI PA-CB authorisation: All cross-border collections through Xflow flow through a regulated, audited channel.
• Automatic eFIRA generation: Every inward remittance auto-generates an eFIRA, a tamper-proof digital receipt required under FEMA for documentation and reconciliation.
• ISO 27001 + SOC 2 certification: Xflow’s infrastructure is independently audited for security, availability, and confidentiality.
• Email authentication (SPF, DKIM, DMARC): Protects against email domain spoofing, the key enabler of BEC attacks. PCI DSS v4.0 now formally requires DMARC/SPF/DKIM.
• Single dashboard visibility: All incoming payments are visible in real time, reducing the window for undetected fraud.
• Alignment with RBI Authentication Directions 2025: Xflow’s authentication infrastructure is designed to meet the April 2026 mandate.

With the risks of fraud and cyberattacks, businesses cannot afford to compromise on payment security. If you run your business operations online and across borders, you need a reliable payment partner that puts security first.

Here's how Xflow emphasizes payment security:

• RBI PA-CB authorised: Xflow operates as an RBI-authorised Payment Aggregator Cross-Border (PA-CB), meaning all cross-border collections flow through a regulated, audited channel.
• ISO 27001 and SOC 2 certified: You get enterprise-grade data protection and confidentiality, independently audited.
• RBI 2026 mandate aligned: Xflow’s authentication infrastructure is aligned with the RBI Authentication Mechanisms for Digital Payment Transactions Directions, 2025, effective April 2026.
• eFIRA for every remittance: Every inward remittance through Xflow auto-generates an eFIRA, a tamper-proof digital receipt satisfying FEMA documentation requirements.
• Email security (SPF, DKIM, DMARC): Xflow protects against email domain spoofing and business email compromise.
• Expert regulatory support: Xflow provides compliance guidance from specialists, as and when you need it.

Receive international payments through a fully secure, RBI-compliant channel.

Passkeys going mainstream

FIDO2-based passkeys are rapidly replacing SMS OTPs as the primary authentication factor in digital payments. The private key never leaves the device, eliminating SIM-swap and OTP interception risks entirely. Several Indian banks are already piloting passkey authentication. The RBI’s 2025 directions explicitly support device-bound tokens as qualifying factors.

AI-based fraud detection

AI and generative AI are already deployed by leading payment processors to analyse historical data and customer behaviour in real time. Future developments will focus on adaptive models that respond faster to emerging fraud patterns and require less human intervention.

RBI Payments Vision 2028

The RBI’s multi-year roadmap for payment security and interoperability sets the trajectory for the Indian payments ecosystem through 2028. Businesses should monitor this roadmap for upcoming compliance obligations.

ISO 20022 for cross-border payments

ISO 20022 became mandatory for FI-to-FI cross-border payments from November 22, 2025. The enriched structured data format improves fraud detection accuracy and sanctions screening by providing more detailed transaction metadata.

e-Rupee (CBDC) and digital currency security

The RBI’s e-Rupee Central Bank Digital Currency (CBDC) pilot is expanding. As digital currency adoption grows, payment security frameworks will need to evolve to address authentication and fraud prevention in a CBDC ecosystem.

Security is at the core of strong payment systems. With Xflow, you meet all your cross-border payment needs fast settlements, low overhead costs, and compliance all while keeping your payment security optimized.

Xflow is also SOC 2 and ISO compliant, which means strict security and data protection standards are followed to ensure your data is safe, private, and handled responsibly.