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Amazon & Walmart automation that eliminated manual work

How Netwin replaced broken manual order syncing with a real-time, dual-certified integration engine passing both Amazon and Walmart security audits on the first submission.

The Challenge

A core system that couldn't keep up

The client’s lending platform built over twelve years as a single monolithic application had become the biggest brake on the business.

Every release was slow and risky, scaling for peak demand was painful, and the architecture simply couldn’t support the AI and integration capabilities their roadmap demanded. A full rewrite felt too risky to attempt.

  • Manual sync was destroying efficiency

    Every order and inventory update required manual reconciliation, costing the team over three working days every week and causing fulfilment delays during peak seasons.

  • Two prior integration attempts had failed

    An internal team tried twice and stalled on Amazon's SP-API OAuth 2.0 complexity and Walmart's strict infrastructure standards the audits proved insurmountable without specialist support.

  • Sync errors were damaging seller ratings

    One in five sync operations produced data errors, causing oversells and inventory mismatches that were actively declining the seller's marketplace rating.

  • Security and compliance were unaddressed

    Amazon and Walmart require formal security audits before granting API access. With no SOC2 framework and unassessed PCI-DSS readiness, the business was blocked from going live on either channel.

The Solution

A phased, zero-downtime
transformation

The client’s lending platform built over twelve years as a single monolithic application had become the biggest
brake on the business.

Every release was slow and risky, scaling for peak demand was painful, and the architecture simply couldn’t support the
AI and integration capabilities their roadmap demanded. A full rewrite felt too risky to attempt.

Real-time API integration engine

Built a secure middleware layer connecting the retailer's ERP to both Amazon SP-API and Walmart Marketplace API, with real-time bidirectional sync of orders, inventory, pricing and fulfilment including retry logic and automated alerting.

01

Security-first architecture

Designed the stack to meet both platforms' audit requirements from day one: OAuth 2.0, TLS 1.2+, AES-256 encryption, isolated network zones, rate limiting and full audit-trail logging built in, not retrofitted.

02

End-to-end audit management

Owned the complete Amazon and Walmart security audit process penetration testing, architecture review, SOC2 readiness and PCI-DSS documentation submitting to both platforms, with both passing on the first attempt.

03

THE RESULTS

A core system that couldn't keep up

3d → <2h

Processing time

12,000+

Orders / month

+38%

GMV in Q1

18% → 0.4%

Error rate
  • Order processing cycle reduced from 3-4 working days to under 2 hours through automation
  • Inventory & order accuracy improved from 82% to 99.6% with automated validation
  • Amazon & Walmart status moved from failed audits to live, compliant marketplace operations
  • Security & compliance upgraded from undocumented processes to SOC 2 + PCI-DSS certified standards

Before

3–4 Days

order processing cycle

After

< 2 Hours

automated processing cycle

Technology We Use

The stack behind the build

Amazon SP-API Walmart Marketplace API OAuth 2.0 TLS 1.2+ AES-256 SOC2 PCI-DSS TLS 1.2+ SOC2 Amazon SP-API Walmart Marketplace API OAuth 2.0 TLS 1.2+ AES-256 SOC2 PCI-DSS TLS 1.2+ SOC2

We tried to build this integration ourselves twice and failed. Within weeks, we were live on both Amazon and Walmart — and the audit process that blocked us for over a year was handled completely, with zero resubmissions.

Mid-size Consumer Electronics Retailer

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