Nellcorp Blog

A new approach to JWT revocation

Assis Ngolo — Fri, 28 Mar 2025 23:52:50 GMT

JSON Web Tokens (JWTs) have become a staple in modern web application authentication. Their stateless nature offers scalability and ease of use, but they present a significant challenge: revocation. Once a JWT is issued, it remains valid until its expiration, even if the user's access should be terminated. Today we introduce a robust solution to this problem, and a clever approach to JWT validation.

The JWT Revocation Conundrum

Traditional session management relies on server-side storage to track user sessions. Revocation is as simple as deleting the session data. JWTs, however, are self-contained and validated without consulting a central authority, making immediate revocation difficult.

Common workarounds like maintaining a blacklist of revoked tokens introduce statefulness, negating the benefits of JWTs. Short-lived tokens mitigate the risk but can lead to a poor user experience with frequent re-authentication.

The Solution: User-Specific Signed JTIs

Our approach leverages a user-specific secret to create a Signed JWT ID (SJTI). This method allows us to invalidate all of a user's JWTs instantly by simply rotating their secret. In reality, this strategy works with any claim besides JTI.

The Core Idea

Each user has a secret: Stored securely in the database.
jti Claim: Each JWT includes a unique jti (JWT ID).
sjti Claim: A signature of the jti using the user's secret. This is added as a custom claim in the JWT.
Validation: On each request, we validate the JWT's signature using the application secret and then validate the sjti using the user's secret.
Revocation: To revoke all tokens for a user, we simply generate a new secret for that user. Existing tokens will fail the sjti validation.

Benefits

Stateless Validation: The core validation remains stateless. We only need to consult the database for the user's secret, which we'd likely do anyway for authorization checks.
Instant Revocation: Rotating the user's secret invalidates all existing tokens immediately.
Scalability: This approach scales well in distributed systems.

A simple Go implementation

Let's dive into the implementation details using Go and Postgres.

1. Database Setup (Postgres)

First, we need to add a token_secret column to our users table:

ALTER TABLE users ADD COLUMN token_secret;

We use a UUID for the secret for added security.

2. Code

a. JWT Generation

func generateToken(userID string) (string, error) {
 // Get user's secret from the database
 user, err := getUser(userID)
 if err != nil {
  return "", fmt.Errorf("could not get user: %w", err)
 }
  
 userSecret, err := decryptUserSecret(user.TokenSecret)
 if err != nil {
  return "", fmt.Errorf("could not get user secret: %w", err)
 }

 // Generate unique JTI
 jti, err := uuid.NewRandom()
 if err != nil {
  return "", fmt.Errorf("could not generate JTI: %w", err)
 }

 // Calculate SJTI
 sjti := calculateHMAC(userSecret, jti.String())

 // Set claims
 claims := jwt.MapClaims{
  "iss":  "your-application",
  "sub":  userID,
  "exp":  time.Now().Add(time.Hour * 1).Unix(), // 1 hour
  "iat":  time.Now().Unix(),
  "jti":  jti.String(),
  "sjti": sjti,
 }

 // Sign the token
 token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
 signedToken, err := token.SignedString([]byte(os.Getenv("APP_SECRET")))
 if err != nil {
  return "", fmt.Errorf("could not sign token: %w", err)
 }

 return signedToken, nil
}

b. JWT Validation

func validateToken(tokenString string) (bool, string, error) {
 // Parse token
 token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
  // Validate signing method
  if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
   return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
  }
  return []byte(os.Getenv("APP_SECRET")), nil
 })

 if err != nil {
  return false, "", fmt.Errorf("could not parse token: %w", err)
 }

 if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
  userID := claims["sub"].(string)
  jti := claims["jti"].(string)
  sjti := claims["sjti"].(string)

  // Get user's secret from the database
 user, err := getUser(userID)
 if err != nil {
  return "", fmt.Errorf("could not get user: %w", err)
 }
  
 userSecret, err := decryptUserSecret(user.TokenSecret)
 if err != nil {
  return "", fmt.Errorf("could not get user secret: %w", err)
 }

  // Calculate expected SJTI
  expectedSJTI := calculateHMAC(userSecret, jti)

  // Compare SJTIs
  if hmac.Equal([]byte(sjti), []byte(expectedSJTI)) {
   return true, userID, nil
  }

  return false, "", fmt.Errorf("invalid SJTI")
 }

 return false, "", fmt.Errorf("invalid token")
}

c. JWT Revocation

func revokeUserSessions(userID string) error {
 // Generate new secret
 newSecret, err := uuid.NewRandom()
 if err != nil {
  return fmt.Errorf("could not generate new secret: %w", err)
 }
  
  encryptedSecret, err := decryptUserSecret(newSecret.String());
   if err != nil {
  return fmt.Errorf("could not encrypt user secret: %w", err)
 }

 // Update the user's secret in the database
 err = updateUserSecret(userID, encryptedSecret)
 if err != nil {
  return fmt.Errorf("could not update user secret: %w", err)
 }

 return nil
}

3. Middleware Implementation example

func AuthMiddleware(next http.Handler) http.Handler {
 return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  // Get token from header
  tokenString := r.Header.Get("Authorization")
  if tokenString == "" {
   http.Error(w, "Unauthorized", http.StatusUnauthorized)
   return
  }

  // Validate the token
  valid, userID, err := validateToken(tokenString)
  if !valid {
   http.Error(w, "Unauthorized: "+err.Error(), http.StatusUnauthorized)
   return
  }

  // Add user ID to context (optional)
  ctx := context.WithValue(r.Context(), "userID", userID)
  next.ServeHTTP(w, r.WithContext(ctx))
 })
}

Comparison with Other Approaches

Feature	User-Specific Signed JTIs	Token Blacklist	Short-Lived Tokens
Revocation	Immediate	Immediate	After Expiration
Statelessness	Mostly	No	Yes
Complexity	Moderate	High	Low
Performance Overhead	Low	High	Low

The Impact of Real-Time Payments on Banking and Consumer Behavior in Angola

Caio Tony — Sat, 25 Jan 2025 10:27:05 GMT

Discussing how real-time payment systems are reshaping customer expectations and financial services.

On Informal Market and its limitations

Angola is one of Africa's top economies, and according to the Angolan national institute for statistics, INE, in 2022 Angola's informal economy employs about 85% of the entire workforce. The informal sector has always played a critical role in the domestic economy, with its impact being widely felt. However, the lack of formal recognition from the banking sector remains one of the biggest hurdles to achieving a more inclusive and dynamic future, especially in terms of adopting new technologies, particularly those focused on real-time payments. Recently, there has been significant growth in the digital wallet space, which represents a major step forward in the open finance landscape. Services like PayPay, Kamba, E-kwanza, and Multicaixa Express have greatly boosted the flow of money by moving it into the digital realm.

While digital wallet adoption has been substantial and provides real-time value, these networks still operate within closed systems. Both the sender and recipient need to register on the platform to make a transfer, and often, a preloaded balance is required. Unlike digital wallets, Real-Time Payments (RTP) is not an external system to banks that requires preloaded funds. Instead, it is a protocol that banks implement, allowing instant debits and credits between accounts at participating banks. This removes the need for preloading funds and directly integrates payment flows into the banking system, offering greater speed and convenience for both users and financial institutions

Impacts on the life of the ordinary citizen.

The Angolan market, as underdeveloped as it is, still relies primarily on cash as the main medium of exchange, which brings several disadvantages, especially concerning physical limitations, such as:

Security Risks: Cash transactions are vulnerable to theft, loss, or fraud. Carrying large amounts of cash makes both consumers and businesses targets for robberies or scams.
Lack of Transaction Transparency: Cash transactions are often untraceable, making it difficult to track spending patterns or conduct audits. This can lead to accounting and tax reporting issues since cash transactions aren't easily documented.
Impact on Customer Experience: Long wait times due to handling cash can lead to a poor customer experience. Consumers often prefer the speed and convenience of digital payments, potentially causing businesses that heavily rely on cash to lose customers.
Logistical Challenges: Due to its physical nature, cash takes up space, making transporting large amounts a complex logistical task. Additionally, handling and storing large sums of cash requires special care and proper infrastructure, increasing operational costs for businesses.

The adoption of a real-time payment (RTP) network could eliminate all these issues, providing a stronger incentive for moving funds. In the past, insecurity in cash transactions created fear. The implementation of RTP would not only reduce these risks but also encourage greater market participation, facilitate exchanges, and contribute to a more dynamic and integrated economy.

Key Areas Where Real-Time Payment (RTP) Systems Are Reshaping Financial Services

Speed and Convenience: RTP systems offer immediate fund transfers, setting a new standard for speed in the financial sector. This shift is especially transformative in areas like e-commerce, peer-to-peer transfers, and bill payments, where real-time settlement improves efficiency and customer satisfaction.

Operational Efficiency: The ability to transfer funds instantly enhances cash flow management for both individuals and businesses. For example, small and medium-sized enterprises benefit from receiving payments immediately, allowing for better liquidity and financial planning. This agility reduces reliance on credit and enables quicker decision-making in response to dynamic market conditions.

Increased Innovation: With the adoption of RTP systems, financial institutions are encouraged to develop innovative services around real-time transactions. This has led to new products, such as real-time fraud detection, instant loan disbursement, and integrated payment systems for the gig economy. Banks and fintechs are exploring how to leverage real-time data to create personalized financial solutions.

Greater Competition and Collaboration: The rise of RTP systems has intensified competition in the financial sector, as traditional banks face challenges from non-banking entities like fintechs and large tech companies. These new entrants often offer innovative payment solutions with lower fees, better user experiences, and more flexible services. In response, many financial institutions have formed partnerships with fintechs or are adopting open banking frameworks to stay competitive and offer more value-added services.

Global Financial Inclusion: RTP systems are also promoting financial inclusion by offering faster and more accessible payment methods for underserved populations. In many developing regions, real-time payments provide a way for individuals and businesses to participate in the formal economy without needing a traditional bank account. Digital wallets and other payment solutions using RTP can empower people in rural or remote areas, giving them access to essential financial services.

Conclusion.

Real-time payment (RTP) systems are not only reshaping customer expectations; they are also fundamentally transforming the infrastructure of financial services. Banks and financial institutions are investing in modernizing their systems to support RTP, with many adopting open banking frameworks that allow for greater interoperability between systems.

Furthermore, the adoption of real-time payments is driving regulatory changes, as central banks and governments establish guidelines for managing operational risk, combating fraud, and protecting consumers in an increasingly real-time environment.

RTP systems are promoting a shift in financial services toward faster, more convenient, and transparent operations, reshaping how customers interact with their finances and how institutions compete. The continued expansion of real-time payments is likely to further drive innovation in digital banking, enhance financial inclusion, and raise service standards across the sector.

Vendor Security Lessons from the CrowdStrike Incident

Assis Ngolo — Fri, 26 Jul 2024 07:15:53 GMT

The CrowdStrike incident has rocked the cybersecurity world showing how crucial it is to have reliable vendors in IT security. CrowdStrike, a top endpoint security provider, rolled out a software update that caused a worldwide IT outage. This event exposed the weak spots that can pop up when you rely on outside security solutions. The fallout spread to many areas, like banking, healthcare, and aviation. This shows how far-reaching these failures can be in our interconnected digital world.

As companies deal with the aftermath of this event, it's clear that picking reliable IT security providers is more important than ever. This article explores the CrowdStrike update problem looking at what it means for business security and ways to reduce risks linked to vendors. By studying this case, we aim to share insights on how to choose vendors, check them , and plan for emergencies. This can help businesses boost their cyber defenses in a world where threats keep getting more complex.

Taking Apart the CrowdStrike Update Problem

A Look at the Worldwide IT Breakdown

On July 19, 2024, at 04:09 UTC, CrowdStrike released a sensor configuration update to Windows systems as part of its normal operations. This update aimed to improve protection mechanisms, but it caused a logic error that led to system crashes and the well-known "Blue Screen of Death" (BSOD) on affected devices. The problem had a wide reach affecting about 8.5 million Windows devices around the world, which makes up less than 1% of all Windows devices .

Instant Effects on Businesses

The aftermath of this failed update hit hard and fast. Key industries faced big disruptions:

Aviation: About 5,000 commercial flights were canceled hitting airports in the US, Europe, Asia, and Oceania.
Banking: Banks like Bradesco, Neon, and Next in Brazil saw their services go down.
Healthcare: Places such as the Hospital de Clínicas de São Paulo had to push back procedures and go back to pen-and-paper records.
Energy: Power companies ran into operational problems.
Technology: Cloud systems serving thousands of businesses took a hit causing a chain reaction across worldwide infrastructure.

Technical Details of the Faulty Update

The faulty update had a connection to Channel File 291, which is part of CrowdStrike's Falcon platform. You can find this file in the C:\Windows\System32\drivers\CrowdStrike\ folder. It manages how Falcon checks named pipe execution on Windows systems. The update aimed to tackle spotted harmful named pipes used in cyber attacks. But it had a logic bug that led to reading memory outside its bounds causing an error that the system couldn't handle well.

How It Affected Windows Systems

The buggy update set off a chain of problems:

Systems with Falcon sensor for Windows version 7.11 and higher crashed if they got the update between 04:09 UTC and 05:27 UTC on July 19, 2024.
Systems that had problems entered a reboot loop making them unusable.
This problem didn't just affect on-site systems; it also had an impact on cloud services, including Microsoft Azure virtual machines.

How CrowdStrike Tackled and Fixed the Issue

CrowdStrike took these steps to address the crisis:

Rolled back the problematic update at 05:27 UTC about 79 minutes after they first deployed it.
Published a manual fix for affected systems. Users had to boot into Safe Mode and delete the faulty Channel File.
Marked the impacted version of the channel file as "known-bad" in the CrowdStrike Cloud.
Promised to make their testing better. This includes local tests before client deployment better stability and content interface testing, and a step-by-step approach for future updates.

This event shows how crucial good testing is. It also highlights how software updates can have big effects in our connected digital world.

What This Means for Enterprise Security

The CrowdStrike incident shows important lessons for business security stressing the need to balance IT management and cybersecurity.

Risks of Automated Update Processes

Automated updates keep systems secure, but they can cause big problems:

Unexpected issues: The CrowdStrike case proves that one bad update can shut down many systems.
Too much trust in automation: Companies might think "set it and forget it," leading them to slack off on watching their systems.
Hackers can take advantage: Bad guys might use weak spots in update systems to spread viruses or take over entire networks.

Challenges in Managing Complex IT Ecosystems

Today's businesses struggle with several issues when it comes to managing their IT systems:

Finding the right mix of security and ease of use: When security gets too complicated, it can mess up how work gets done and slow things down.
Keeping talented people: When companies can't hold on to skilled security experts, they might fall behind on updates and putting new measures in place.
Too much complexity: With so many different tools to deal with various security threats, systems have become tricky and hard to handle.

Striking a Balance Between Security and Smooth Operations

It's essential to keep security tight while making sure everything runs :

Update resistance: Systems in stable condition often make people scared to install important security fixes causing delays.
Testing challenges: Security teams with too much work may not have enough time or tools to test updates well before using them.
Need for integrated solutions: Easy-to-use, combined, and automatic security tech can cut down on manual tasks and make people more sure about putting updates in place.

Ways to Lower Risks from Vendors

Setting Up Tough Update Testing Steps

To cut down on dangers from vendor updates, companies should set up full testing steps. This means doing careful checks of updates before using them, including local tests and better stability checks. Using a step-by-step plan for future updates can help spot possible problems before they affect the whole system.

Improving Incident Response and Recovery Strategies

Creating a strong incident response plan has a crucial impact on reducing the effects of vendor-related incidents. This plan should include clear steps to identify, contain, and lessen cyber incidents. To test and update the incident response plan , along with running simulated exercises, ensures that all team members are ready to handle potential crises well.

Enhancing Vendor Evaluation and Diversifying Security Solutions

Companies need to check IT security vendors before picking them. This means looking at their credentials, money situation, and whether they follow industry rules. Using different suppliers can cut down on weak spots and boost how well things run. Also, using tools that watch things all the time helps catch and fix problems right away making sure vendors keep doing what the company wants.

Keeping an eye on how much access vendors have

Security tools, like Crowdstrike sensor, should have careful and watched access to the system at the core level. Companies should spell out how important different levels of access are by how deep they go into the system and how far they reach in the network. Vendors should tell and explain why they need certain access, and have plans to lessen problems and recover from any issues their tools might cause at each risk level.

Investing in Redundancy and Failover Systems

To keep businesses running during vendor-related problems, companies need to have backup and failover systems in place. This means using extra servers, power supplies, and network gear. Failover plans help cut downtime by moving traffic and services to backup systems when things go wrong. Companies should also think about using load balancers and virtual tech to make their systems stronger and use resources better.

Conclusion

The CrowdStrike incident shows how crucial it is for companies to stay alert when dealing with IT security vendors. This event highlights why businesses need to check out vendors, do thorough testing, and have solid plans to handle problems. By taking these steps, companies can better shield themselves from the widespread effects of vendor mistakes and boost their overall cybersecurity defenses.

As the digital scene keeps changing, the link between companies and their IT security providers grows more and more important. Checking how well they're doing knowing about their security steps, and having a good backup plan are key ways to cut down on risks. In the end, it's crucial for businesses to stay ahead in handling their IT security teamups. If you want to look over your security setup and provider risk, feel free to get in touch with us for expert advice.

Understanding the Payments Ecossystem: Building a PayFac and Ensuring PCI DSS Compliance

Assis Ngolo — Wed, 08 May 2024 09:12:00 GMT

In today’s digital world, mastering payment technology is crucial for businesses to stay competitive. Payment Facilitators (PayFacs) simplify how merchants process payments, offering enhanced customer experiences and operational efficiency.

However, becoming a PayFac involves navigating complex regulatory requirements like PCI DSS certification and integrating advanced fraud prevention, KYC, AML, and risk management practices. Building strong partnerships with payment processors, issuers, acquirers, and card networks is crucial for smooth merchant onboarding, chargeback management, and overall payment flow.

This post will guide you through becoming a PayFac and ensuring compliance with PCI DSS standards, covering essential steps and benefits along the way.

What is a Payment Facilitator (PayFac)

A Payment Facilitator (PayFac) allows merchants to accept electronic payments without needing their own merchant account. Payment facilitators aggregate multiple merchants under a single merchant account, allowing them to offer payment processing services to these merchants. They take on the responsibility of underwriting, onboarding, and managing the merchant relationships, as well as handling the settlement of funds. This model allows smaller merchants to accept credit and debit card payments without the overhead and complexity of setting up their own merchant account.

Historical Context

The payment facilitator model emerged in the early 2000s to provide payment processing services to smaller merchants who couldn't qualify for their own merchant accounts. Traditional payfac solutions were popular because they helped small- and medium-sized businesses accept online payments more easily. The payfac model reduces the complexity of getting started with online payments and allows companies to focus on their core competencies. The payfac sets up and manages multiple relationships and systems on behalf of the merchant.

Modern PayFac Solutions

Modern payment facilitator solutions often incorporate advanced features and capabilities, such as:

Reduced barriers to entry: PayFacs make it easier for smaller merchants to accept electronic payments by handling the complexities of setting up a merchant account.

Streamlined operations: PayFacs take on the administrative tasks of managing merchant relationships, settlement, and compliance, allowing merchants to focus on their core business activities.

Scalability and flexibility: As merchants grow, PayFacs can easily scale their payment processing capabilities to meet the increasing demand.

Access to advanced features: PayFacs often provide access to a range of value-added services and features that may not be readily available to merchants with their own merchant accounts.

Payment facilitators are essentially mini payment processors that provide services allowing merchants to accept card-not-present (CNP) and card-present (CP) payments. The first payment facilitators didn't arrive on the payments scene until the late 2000s, but they have since become essential to how the industry works and are an important part of the payments layer cake. With traditional merchant accounts, businesses are required to apply for a merchant account and purchase or build the software and hardware needed to accept card payments. With modern PayFacs, businesses are onboarded to the PayFac's platform, which acts as the go-between by hooking into a payment processor directly.

Setting Up Your PayFac: Step-by-Step Guide

The Role of Acquirers and Gateways

Every payment facilitator (PayFac) must register with a sponsoring acquirer, which is a bank that offers merchant accounts. The acquirer conducts an underwriting process to verify the legality of the business and analyze its financial situation. Once the requirements are met, the sponsoring acquirer registers the business as a payment facilitator and provides a unique PayFac identifier and a Master ID (MID) account. Written confirmation of registration is required before operating as a PayFac.

PayFacs utilize their acquirer's processor to handle payments processed through their platform. If they have contracts with multiple acquirers, they will use the respective processors for different sub-merchants.

Choosing a Sponsoring Acquirer

When looking for a sponsor bank, it's crucial to check their ratings, ask how many PayFacs they've worked with, and find out how long they've been a registered sponsor. Banks with experience and a tried-and-true system in place are more likely to have fine-tuned their approach.

It's paramount that PayFacs work with a sponsor bank that has a strong compliance department and makes it easy for FinTechs to report suspicious activity. The sponsor bank should provide cloud-based transaction monitoring services as part of their AML services to prevent financial crimes.

Infrastructure Build-Out

Setting up a Payment Facilitation platform requires robust technology and infrastructure to ensure smooth, reliable, and secure payment processing. Key features include advanced fraud detection and prevention tools, customizable risk settings, and a robust reporting and analytics dashboard.

Onboarding merchants onto the PayFac platform is critical, requiring streamlined processes for collecting and verifying merchant information, setting up merchant accounts, and managing payment processing. Customizable onboarding workflows, automated underwriting processes, and support for target payment methods and MCC codes are essential.

Acquiring Necessary Licenses

As a payment facilitator, you will need to obtain various licenses and registrations to operate legally and compliantly. The specific requirements may vary depending on your location and the jurisdictions in which you plan to operate, but here are some common licenses and registrations that you may need:

US Money Transmitter License
In the US, most states require payment facilitators to obtain a money transmitter license, which allows you to transfer funds on behalf of merchants. The application process can be lengthy and involves background checks, financial audits, and bonding requirements.

US Federal and State Registrations
Depending on your business structure and location, you may need to register with federal agencies like the Financial Crimes Enforcement Network (FinCEN) and obtain an Employer Identification Number (EIN) from the Internal Revenue Service (IRS). Additionally, you'll need to register your business with the appropriate state agencies and obtain any necessary permits or licenses.

Payment Institution and Electronic Money Institution licenses
In Europe, payment facilitators may be required to obtain PI (Payment Institution) or EMI (Electronic Money Institution) licenses in order to offer merchant services and handle and initiate payments. The specific requirements for these licenses can vary by country, so it's important to research the regulations in each European market you plan to operate in.

Licenses in Other Jurisdictions
Beyond the US and Europe, payment facilitators may need to obtain additional licenses and registrations depending on the countries they serve. For example, in some Asian countries, payment facilitators may need to register as a Payment Service Provider (PSP) or obtain a Payment Intermediary License. In Latin American countries, there may be requirements for a Payment Institution or Electronic Money Issuer license. Thoroughly research the licensing landscape in each target market to ensure full compliance.

Payment Facilitator Registration
Major card networks, such as Visa and Mastercard, require payment facilitators to register with them and comply with their rules and regulations. This registration process involves submitting detailed information about your business, management team, and payment processing operations.

Compliance with Regulations
Payment facilitators must comply with various regulations, including anti-money laundering (AML) and know-your-customer (KYC) laws, data privacy and security regulations (such as GDPR and PCI DSS), and consumer protection laws. Failure to comply with these regulations can result in significant fines and legal consequences.

It is important to conduct thorough research and gain a comprehensive understanding of the licensing and registration requirements in the jurisdictions where you intend to operate. Seeking guidance from legal professionals and compliance experts can assist you in successfully navigating this process and avoiding any potential pitfalls.

For instance, in Europe, PayFacs may be required to obtain PI (Payment Institution) or EMI (Electronic Money Institution) licenses in order to offer merchant services and handle and initiate payments.

Establishing Connectivity

Connecting to the acquirer’s systems is crucial for seamless integration and testing processes. This involves implementing merchant management systems that allow for efficient interaction with merchants. These systems typically include features such as dashboards, payout mechanisms, and tools for managing disputes related to chargebacks.

The role of a PayFac requires a bidirectional flow of information with the acquirer. On one hand, the PayFac is responsible for sending transaction data to the acquirer. On the other hand, the acquirer must have access to the PayFac's system to monitor performance and ensure compliance with relevant regulations and standards.

Managing and Operating as a PayFac

Readiness and Financial Assessment

Managing and operating as a PayFac involves several key responsibilities. Conducting thorough due diligence on potential sub-merchants is crucial to assess their risk profiles and weed out any bad actors. This involves evaluating factors such as the volume of transactions, industry or sector, countries of operations, and channels in use. Assigning appropriate risk levels to sub-merchants based on this assessment is essential for effective risk management.

Managing Sub-Merchant Onboarding

Onboarding sub-merchants requires a comprehensive Know Your Customer (KYC) process to verify the legitimacy of the business and ensure their money comes from legitimate sources. This includes collecting and verifying information such as the company name, registered address, tax identification number, sales turnover, ownership, and bank details. Automation can streamline the onboarding process by validating data, minimizing errors, and boosting conversions. PayFacs must also screen sub-merchants against crime suspicion, economic sanctions, and the US Treasury's Office of Foreign Asset Control's (OFAC's) or the Financial Action Task Force's (FATF's) sanctions lists. Additionally, checking the Member Alert to Control High Risk Merchants (MATCH) report is required to ensure that sub-merchants have not been terminated by other payment entities.

Risk and Compliance Monitoring

Risk management should not end at merchant onboarding; it must be a continuous process that actively monitors sudden or unexpected changes in sub-merchant business patterns, such as changes in the fundamental nature of business, transaction volumes, or cross-border operations. Spikes in business activity, product changes, or the introduction of new channels or segments should also trigger a reassessment of risk scores. Maintaining PCI compliance is essential for PayFacs to ensure the safety and security of sensitive cardholder and authentication data. Compliance with PCI-DSS protects sub-merchants and their customers by minimizing the possibility of data breaches, identity theft, fraud, and attacks.

Fraud and Chargeback Management

Ensuring robust fraud and chargeback management practices is crucial. While becoming a PayFac can create new revenue streams, it also carries the risk of losses from chargebacks. PayFacs are responsible for managing the chargeback process along with the acquirer, responding to documentation requests, and bearing the transaction amount if unable to recover funds from the sub-merchant. Implementing risk and fraud mitigation practices, such as initially low processing limits or robust transaction monitoring, is crucial to guard against losses from chargebacks. Effective chargeback management involves promptly addressing disputes, providing necessary documentation, and working closely with sub-merchants to resolve issues.

Payouts and Reporting

Managing payouts and reporting is another important aspect of operating as a PayFac. PayFacs must manage the payment of funds out to their sub-merchants, ensuring timely payouts. Additionally, they must be prepared to report sub-merchant activity to their sponsoring acquirer on a quarterly basis or whenever requested. Accurate and timely reporting helps maintain transparency and accountability.

Global Expansion

As PayFacs expand globally, they may need to adapt to different AML regulations and legislative landscapes across various countries. Obtaining necessary licenses, such as Payment Institution (PI) or Electronic Money Institution (EMI) licenses, especially in Europe, may be required to provide merchant services and handle payments.

Key Components of PCI DSS Compliance

The PCI Data Security Standard (PCI DSS) defines security requirements to protect environments where payment account data is stored, processed, or transmitted. PCI DSS provides a baseline of technical and operational requirements designed to protect payment account data. To put it simply, the PCI DSS standards are there to protect cardholder data. Developed and maintained by the PCI DSS council (founded by five of the largest card brands: American Express, Discover, JCB, Mastercard, and Visa), the PCI standards are a collaborative effort within the payments industry to uphold and protect the integrity of the payments system to ensure security for cardholders.

PCI DSS Overview

Achieving PCI DSS compliance is crucial for safeguarding payment data. The PCI Data Security Standard (PCI DSS) defines security requirements to protect environments where payment account data is stored, processed, or transmitted. PCI DSS provides a baseline of technical and operational requirements designed to protect payment account data. To put it simply, the PCI DSS standards are there to protect cardholder data. Developed and maintained by the PCI DSS council (founded by five of the largest card brands: American Express, Discover, JCB, Mastercard, and Visa), the PCI standards are a collaborative effort within the payments industry to uphold and protect the integrity of the payments system to ensure security for cardholders.

Compliance with PCI DSS involves several steps. The first step is identifying the systems and technology used for payment processing, also known as "scoping," and determining where any vulnerabilities lie. This process helps you understand the scope of your payment processing environment and identify areas that need improvement. The next step is securing your systems according to the PCI standards, addressing any vulnerabilities, and, if possible, eliminating any storage of cardholder data. Finally, you need to submit compliance reports to your acquiring banks and card networks, demonstrating that you have taken the necessary steps to comply with the PCI DSS requirements.

For PayFacs, maintaining ongoing PCI compliance is essential. The ability to uphold transparent data security protocols that are deemed compliant with PCI is what ultimately protects you and your sub-merchants from data compromise and its associated costs – from both a financial and brand integrity perspective. Regular assessments and transparent security protocols help protect both the PayFac and its sub-merchants. Compliance not only minimizes the risk of data breaches but also maintains trust and credibility.

Effective communication between a PayFac and its sub-merchants is critical for maintaining PCI compliance. Once the PayFac is educated on PCI compliance, it must pass on the education that is applicable to its sub-merchants. The sub-merchant must be mindful of what they are responsible for and why. The "why" is often the most challenging but also the most important. For both a PayFac and sub-merchant, knowing why the steps they are taking to protect cardholder data is important will give context and substance to the policies and procedures.

Repetition of compliant activities is pivotal to maintaining PCI compliance. Once the policies and procedures are in place, the next step is to ensure these become part of the normal business routine for both the PayFac and their sub-merchant. Regular training and reinforcement of security practices help ensure ongoing compliance.

The Future of PayFacs

The PayFac industry is poised for significant growth, with a projected compound annual growth rate (CAGR) of over 15% from 2022 to 2027. Key drivers include the rise of e-commerce and digital payments, accelerated by the COVID-19 pandemic. As businesses move online, the demand for seamless, secure payment solutions increases. PayFacs offer an efficient way for merchants to accept payments across various channels, including online, in-store, and mobile.

Technological advancements, such as embedded finance, are creating new opportunities for PayFacs to provide a more integrated experience. Security and compliance remain critical as PayFacs invest in robust measures to protect against cyber threats and adhere to standards like PCI DSS, enhancing trust and credibility.

Specialization is another trend, with PayFacs increasingly catering to specific industries like healthcare and e-commerce. This focus allows them to offer tailored solutions that better meet the unique needs of their clients.

Conclusion

Becoming a Payment Facilitator offers a strategic advantage in the digital economy. By understanding the steps involved and ensuring compliance with PCI DSS, businesses can streamline payment processes, reduce risks, and provide better services to their customers. The future of the PayFac industry looks promising, with continued growth, innovation, and a strong focus on security and compliance. As the demand for efficient and secure payment solutions continues to rise, PayFacs are well-positioned to play a crucial role in enabling businesses to thrive in the ever-evolving digital economy.

Apple Pay Implementation Review: How Does It Really Work?

Assis Ngolo — Tue, 12 Mar 2024 08:31:00 GMT

Apple Pay has revolutionized the landscape of digital wallets, offering a seamless and secure method for contactless payments. This innovative technology leverages Near Field Communication (NFC) and advanced encryption protocols to facilitate transactions, making it a game-changer for both consumers and merchants. As Apple Pay continues to gain traction in the global market, it has become imperative for software developers and payments experts to grasp its intricate implementation details and security features.

This comprehensive review delves into the inner workings of Apple Pay, exploring its architecture, merchant implementation process, and robust security measures. We'll examine the role of tokenization in safeguarding cardholder data, the integration of the Secure Element for enhanced protection, and the compliance standards set by EMVCo and PCI DSS. Additionally, we'll break down the payment authorization flow, discussing how Apple Pay interacts with payment processors, acquirers, and card networks to enable smooth customer-initiated transactions. By the end of this article, readers will have a thorough understanding of Apple Pay's implementation and its impact on the evolving landscape of digital payments.

Understanding Apple Pay Architecture

Apple Pay's architecture is designed to ensure secure, reliable transactions while maintaining user privacy. It leverages a combination of hardware and software components to achieve this goal. Let's take a closer look at the key elements that make up the Apple Pay ecosystem.

Apple Pay Components

The primary components of Apple Pay include:

Secure Element (SE): A certified chip that securely stores payment information and runs the Java Card platform, compliant with financial industry requirements.
Near Field Communication (NFC) controller: Handles communication protocols between the Application Processor, Secure Element, and point-of-sale terminals.
Apple Wallet app: Allows users to add and manage credit, debit, and other types of cards, as well as make payments using Apple Pay.
Secure Enclave: Manages the authentication process and enables payment transactions on supported devices.
Apple Pay servers: Responsible for setup, provisioning, and management of payment credentials, as well as communication with payment networks and card issuers.

Secure Element and Tokenization

The Secure Element plays a crucial role in protecting sensitive payment information. It stores a unique Device Account Number (DAN), which is a tokenized representation of the user's actual credit or debit card number, and is unique to each device. Tokenization replaces the Primary Account Number (PAN) with a token, ensuring that the original card number is never exposed during transactions.

The Secure Element is certified based on the Common Criteria standard and complies with EMVCo security requirements. It communicates with the NFC controller to facilitate secure transactions between the device and payment terminals.

Payment Flow Overview

When a user initiates an Apple Pay transaction, the following steps occur:

Authentication: The user authenticates using Face ID, Touch ID, or a passcode on their device.
Token generation: The Secure Element generates a dynamic cryptogram using the DAN, token key, and transaction details.
Data transmission: The NFC controller securely transmits the tokenized payment information to the payment terminal.
Payment processing: The payment terminal sends the transaction data to the acquirer, which forwards it to the appropriate card network.
Token decryption: The card network decrypts the token to obtain the original PAN and sends the transaction to the issuing bank for authorization.
Transaction approval: The issuing bank approves or declines the transaction and sends the response back through the card network and acquirer.
Confirmation: The payment terminal receives the transaction result, and the user is notified of the outcome on their device.

Throughout this process, the user's actual card number is never shared with the merchant or stored on the device, significantly reducing the risk of fraud and data breaches.

By leveraging the power of tokenization, secure hardware components, and encrypted communication channels, Apple Pay's architecture provides a robust and reliable foundation for secure contactless payments. This comprehensive approach to security has contributed to the widespread adoption of Apple Pay among consumers and merchants alike.

Implementing Apple Pay for Merchants

Merchants looking to offer their customers the convenience and security of Apple Pay need to follow a streamlined setup process and ensure seamless integration with their existing payment infrastructure. This section explores the key steps involved in implementing Apple Pay for merchants, including the merchant setup process, integration with payment gateways, and handling user authentication.

To get started with Apple Pay, merchants must first register with Apple and obtain a merchant identifier. This unique ID is used to identify the business and securely process transactions. Merchants also need to create a payment processing certificate to encrypt transaction data, ensuring that sensitive information remains protected throughout the payment flow.

Once the merchant identifier and payment processing certificate are in place, the next step is to enable the Apple Pay capability within the merchant's app or website. For iOS apps, this involves configuring the project in Xcode and selecting the appropriate merchant identifier. Web developers can utilize the Apple Pay JavaScript API to integrate Apple Pay functionality into their websites.

Merchants often rely on payment gateways and service providers to handle the complexities of payment processing. Many popular e-commerce platforms and payment service providers, such as Shopify, Stripe, and Braintree, offer built-in support for Apple Pay. These providers simplify the integration process by providing SDKs and APIs that abstract away the low-level details of Apple Pay implementation.

When a customer initiates an Apple Pay transaction, the merchant's app or website must handle user authentication. This process typically involves presenting the Apple Pay sheet, which prompts the user to authenticate using Touch ID, Face ID, or their device passcode. The authentication process ensures that only authorized users can complete the transaction, adding an extra layer of security.

Behind the scenes, Apple Pay uses tokenization to protect sensitive payment information. When a customer authenticates and authorizes a transaction, the merchant receives a device-specific token instead of the actual credit or debit card number. This token can only be used by that particular merchant, rendering it useless if intercepted by malicious actors. Tokenization significantly reduces the risk of fraud and data breaches.

To further enhance security, Apple Pay transactions also include a dynamic security code unique to each transaction. This code is generated by the Secure Element within the customer's device and is validated by the payment network during processing. The dynamic nature of this code makes it extremely difficult for fraudsters to replicate or forge transactions.

Merchants implementing Apple Pay should also be aware of the payment standards and compliance requirements. Apple Pay adheres to the EMV (Europay, Mastercard, and Visa) standard for secure payments and is compliant with the Payment Card Industry Data Security Standards (PCI DSS). Merchants must ensure that their own systems and processes meet these standards to maintain the integrity of the payment ecosystem.

Implementing Apple Pay offers significant advantages for merchants, including increased convenience for customers, reduced friction in the checkout process, and enhanced security. By leveraging the expertise of payment service providers and following best practices for integration and authentication, merchants can successfully adopt Apple Pay and provide their customers with a seamless and secure payment experience.

Security Features and Compliance

Apple Pay has an impact on the security and compliance landscape of digital payments, introducing advanced features to protect sensitive cardholder data and prevent fraud. The platform adheres to industry standards set by EMVCo and the Payment Card Industry Data Security Standards (PCI DSS), ensuring a secure environment for contactless payments.

Tokenization and Data Protection

One of the key security features of Apple Pay is tokenization. When a user adds a credit, debit, or prepaid card to their Apple Pay wallet, the actual card number is replaced with a unique Device Account Number (DAN). This DAN is encrypted and stored securely in the device's Secure Element, a certified chip designed to safeguard payment information.

During a transaction, the DAN and a dynamic security code are transmitted to the payment terminal, ensuring that the user's actual card number is never exposed. This tokenization process significantly reduces the risk of fraud and data breaches, as the original card information is not stored on the device or shared with merchants.

Security Feature	Description
Tokenization	Replaces actual card number with a unique Device Account Number (DAN)
Secure Element	Certified chip that securely stores payment information on the device
Dynamic Security Code	One-time code generated for each transaction to prevent unauthorized use

PCI DSS Compliance

Apple Pay is designed to comply with the Payment Card Industry Data Security Standards (PCI DSS), a set of requirements aimed at ensuring the secure handling of payment card information. By adhering to these standards, Apple Pay helps merchants and payment processors maintain a secure environment for processing transactions.

PCI DSS compliance in Apple Pay is achieved through several measures:

Encryption of payment data during transmission and storage
Secure authentication methods, such as Face ID, Touch ID, or passcode
Regular security assessments and penetration testing
Strict access controls and monitoring of the payment infrastructure

Fraud Prevention Measures

In addition to tokenization and PCI DSS compliance, Apple Pay incorporates various fraud prevention measures to detect and mitigate potential security threats. These measures include:

Device-specific authentication: Each Apple Pay transaction is linked to a specific device, making it difficult for fraudsters to use stolen payment information on another device.
Location-based security: Apple Pay can use the device's location services to verify the legitimacy of transactions and detect suspicious activity.
Transaction monitoring: Apple Pay and the issuing banks continuously monitor transactions for signs of fraud, such as unusual spending patterns or high-risk locations.
Lost mode and remote wipe: If a device is lost or stolen, users can suspend or remove their payment cards from Apple Pay using the Find My feature, preventing unauthorized access to their payment information.

By combining advanced security features like tokenization, PCI DSS compliance, and fraud prevention measures, Apple Pay provides a secure and reliable platform for contactless payments. As the adoption of mobile payments continues to grow, these security features play a crucial role in protecting users' financial information and maintaining trust in the digital payment ecosystem.

Conclusion

Apple Pay has brought about a revolution in digital payments, offering a seamless blend of convenience and security. Its robust architecture, built on existing tokenization standards and technology, and secure hardware components, provides a strong foundation for safe contactless transactions. The implementation process for merchants, while requiring some initial setup, ultimately leads to a smoother checkout experience for customers and enhanced security for sensitive payment data.

The impact of Apple Pay on the digital payments landscape is significant, pushing the boundaries of what's possible in mobile transactions. Its adherence to industry standards and incorporation of advanced fraud prevention measures have set a new benchmark for secure payment solutions. To take advantage of this groundbreaking technology and integrate Apple Pay into your platforms, reach out to our team of experts. As the world of digital payments continues to evolve, Apple Pay stands as a shining example of innovation in action, paving the way for a future where secure, convenient payments are the norm.