Multi-Marketplace Walmart & eBay API Integrations for Pakistani Sellers
Diversify your e-commerce revenue beyond Amazon. Mr Umer Malik builds direct, automated API integrations connecting your Shopify, WooCommerce, or ERP platform with Walmart Marketplace and eBay—synchronizing catalog listings, real-time stock, and orders without ongoing SaaS fees.
Core Capabilities & Production Deliverables
Direct architectural execution by senior engineer Mr Umer Malik with zero agency dilution.
Walmart Marketplace Direct API Integration
Native integration with Walmart Developer Portal automating product item setup, price parity compliance, and inventory updates.
eBay Trading & Fulfillment REST APIs
Direct eBay OAuth2 integration managing active listings, variation matrices, and shipping status updates in real time.
Unified Multi-Channel Inventory Engine
Central inventory broker updating stock counts across your website, Walmart, and eBay within 15 seconds of any sale.
Unified Order Routing & WMS Sync
Consolidating customer orders from Walmart and eBay into your centralized warehouse management or shipping system (ShipStation).
Dynamic Marketplace Pricing Rules
Automated pricing algorithms enforcing Walmart price parity rules and factoring in eBay final value fees to protect margins.
Walmart TwoDay Delivery & WFS Automation
Automating Walmart Fulfillment Services (WFS) inventory transfers and Expedited TwoDay delivery badge compliance.
Why Pakistani Scale-Ups Choose Direct Senior Engineering
Local software houses deliver fragile code and cycle junior interns through your project. Here is the direct senior engineering alternative.
PKT (UTC+5) Instant Daytime Collaboration
Direct, real-time collaboration with senior software architect Mr Umer Malik during standard business hours via Slack, WhatsApp, or phone.
Predictable Milestone Pricing in PKR & Legal NDA
Deliverables quoted in transparent Pakistani Rupees (PKR) with zero open-ended billing, backed by SECP-compliant bilateral mutual NDA and 100% IP assignment.
Sub-30ms Local Edge Caching & Optimization
Systems optimized specifically for Pakistani broadband and mobile data networks (PTCL, Nayatel, StormFiber, Jazz 4G), eliminating lag.
Direct Senior Principal Partnership
Work directly with the lead engineer writing your production architecture with zero account managers or communication lag.
Phased Delivery Roadmap & How This Project Runs
Structured from initial discovery call to production deployment and 100% intellectual property transfer.
Phase 01: Architecture Scoping & Fixed PKR Milestone Scoping
30-minute scoping call to map technical requirements, database architecture, and agree on fixed milestone pricing in PKR with zero hidden fees.
Phase 02: Private Git Repository & Staging Environment
GitHub repository initialized under your organization, signed bilateral mutual NDA under Pakistani Law, and private staging environment deployed.
Phase 03: Fast Iteration Sprints & Weekly Staging Demos
Daily code commits and weekly staging demo links where you test functional features with real data throughout the sprint.
Phase 04: Production Launch, Load Testing & 100% IP Handover
Zero-downtime cutover, sub-30ms network speed tuning, FBR / payment gateway certification, and 100% source handover + 30-day warranty.
Frequently Asked Questions
Review the standard engagement guidelines and operational parameters.
Can you help our store qualify for the Walmart Pro Seller Badge? ▼
How does inventory stay synchronized between eBay and Shopify? ▼
Can orders from Walmart and eBay flow into ShipStation automatically? ▼
How do you handle variations like size and color across different marketplaces? ▼
Who owns the intellectual property and code repository? ▼
What post-launch warranty and support is included? ▼
Great dreams deserve craftsmanship, not compromises. Let’s build yours.
REGIONAL OPERATIONS / STATES WE SERVE
© 2026 UMER XPERT. SERVING PAKISTAN — KARACHI ✦ LAHORE ✦ ISLAMABAD. ALL RIGHTS RESERVED.