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E-Commerce Platform Unlocks International Growth Through Custom Payment Gateway Engineering

About the Client

The client was a leading online retail marketplace operating across the U.S. and Europe, known for its extensive catalog of apparel, lifestyle, and home products. With nearly 7 million monthly active users and a rapidly expanding seller ecosystem, the company was prepared for global growth—but its payment infrastructure wasn’t.

International customers faced repeated checkout failures due to unsupported payment methods, high FX fees, slow processing times, and inconsistent authorization rates. LATAM and APAC markets, in particular, showed strong traffic but poor conversions. The company recognized that without a purpose-built payment gateway optimized for cross-border commerce, international expansion would stall.

The client partnered with Zymr to design a custom, PCI DSS–compliant global payment gateway, engineered for speed, fraud reduction, local preferences, and seamless omnichannel experiences—all without disrupting the millions of transactions already happening on the platform.

Key Outcomes

Checkout Time Reduced by 45%
120% Increase in Successful International Transactions

Business Challenges

The discovery phase revealed systemic limitations affecting conversion rates, fraud exposure, and operational performance.

High Cart Abandonment in LATAM & APAC

Customers in emerging markets rely heavily on region-specific methods like:

  • PIX, Boleto (Brazil)
  • Gcash, GrabPay (Southeast Asia)
  • Bank transfers & QR payments (APAC)
    None of these were supported, leading to over 52% abandonment during payment.

Slow Cross-Border Transaction Speeds

International payments were routed through the client’s U.S. processor, causing:

  • High latency
  • Increased declines
  • High FX markups
  • Unpredictable settlement times

This slowed mobile checkout and directly harmed the user experience.

Rising Chargebacks and Fraud

The existing processor lacked:

  • Behavior-based fraud scoring
  • Device fingerprinting
  • Bot detection
  • Velocity rules for high-risk countries

This resulted in rising chargeback rates and payment disputes, with fees mounting each quarter.

Lack of Payment Data Visibility

The platform had no way to examine:

  • Reason codes
  • Authorization trends
  • Processor performance
  • Regional failures
  • Decline patterns

Optimization was guesswork rather than data-driven.

Incomplete PCI DSS Alignment

Rapid scale exposed gaps in:

  • Tokenization
  • Storage practices
  • Access control
  • Logging and monitoring
  • Periodic compliance checks

The company risked non-compliance as transaction volumes increased.

Business Impacts / Key Results Achieved

Zymr’s custom-engineered payment gateway enabled the e-commerce platform to become a truly global marketplace. By addressing cross-border friction, compliance requirements, fraud risk, and payment localization, the client unlocked new revenue, improved operational efficiency, and positioned itself as a regional leader in international commerce.

  • Checkout Time Reduced by 45%

The new low-latency architecture and optimized payment flows significantly accelerated the checkout experience, especially on mobile.

  • Chargebacks Dropped by 38%

Stronger fraud controls + better risk scoring reduced fraudulent disputes.

  • 120% Increase in Successful International Transactions

Local acquiring and payment method support dramatically increased acceptance in LATAM and APAC.

  • Higher Customer Trust & Reduced Abandonment

Localized flows, transparent conversion, and higher transaction reliability improved user confidence.

  • Improved FX and Settlement Efficiency

Local processing slashed FX fees and made payouts faster for sellers.

  • Lower Operational Costs

Reduced chargebacks and local routing decreased operational and finance overhead.

  • Scalable Payment Infrastructure

Future expansions into the Middle East and EU required minimal additional engineering.

  • Better Seller Satisfaction

Sellers benefited from faster settlement cycles and fewer failed international transactions.

Strategy and Solutions

Zymr delivered a custom-engineered, PCI DSS–compliant global payment gateway designed to reduce friction, expand local acceptance, and strengthen fraud defenses.

1. Custom Global Payment Gateway Architecture

Zymr built a modular gateway using:

  • Node.js microservices
  • AWS ECS for container orchestration
  • Lambda-based event processing
  • DynamoDB + Redis caching for low-latency data retrieval
  • PCI DSS–compliant token vaulting

The gateway was built to support:

  • Multi-gateway routing
  • Local acquirer routing
  • Multi-currency processing
  • Real-time fraud detection
  • Wallet integrations
  • Seamless mobile SDKs

It functioned as a single orchestration layer, abstracting complexities from the e-commerce platform.

2. Local Payment Method Enablement for LATAM & APAC

Zymr integrated 20+ local methods, including:

  • PIX, Boleto, OXXO, SPEI (LATAM)
  • Alipay, WeChat Pay, GrabPay, GCash, PayNow (APAC)
  • Local debit networks & bank redirects
  • SEPA, SOFORT, Bancontact (EU expansion support)

This allowed shoppers to pay using regionally preferred flows, dramatically reducing checkout friction.

3. Cross-Border Routing & Local Acquiring

Zymr introduced intelligent routing rules based on:

  • Region
  • Currency
  • Issuer bank
  • Device type
  • Transaction amount
  • Historical success rates

We added local acquiring banks in LATAM and APAC to boost success rates and cut FX fees.

Benefits included:

  • Faster authorization times
  • Higher approval rates
  • Lower FX fees
  • Local settlement capability

4. 24/7 Real-Time Fraud Detection Engine

Fraud detection used:

  • Machine-learning scoring
  • Behavioral analysis
  • Device fingerprinting
  • IP & geolocation clustering
  • Bot detection heuristics
  • Velocity thresholds
  • Custom rules per country

The engine responded in under 100ms, ensuring no added friction for legitimate users.

5. Checkout Optimization and UX Redesign

Zymr rebuilt the checkout flow with:

  • One-tap wallet payments
  • Auto-saved tokenized cards
  • Local language + local currency
  • Faster mobile rendering
  • Real-time transaction feedback

This reduced checkout steps from 5 to 2 for mobile.

6. PCI DSS Level 1 Compliance

Zymr helped the platform achieve full compliance by implementing:

  • Strict RBAC
  • Centralized key management
  • Tokenized storage
  • Secure API gateways
  • Continuous audit logging
  • Quarterly vulnerability scanning
  • Cryptographic controls for all payment data

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