Multi-Marketplace Walmart & eBay API Integrations for Spain Sellers
Engineered for Spain commercial operations — 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 Spain Businesses Hire Directly
Direct senior developer partnership with fixed milestone pricing in EUR (€) and zero agency markup.
Rapid Engineering Velocity
Autonomous sprint progress with daily code commits pushed directly to your private Git repository.
Fixed Milestone Pricing in EUR
Transparent quotes agreed upfront in EUR (€) with fixed deliverables, mutual NDA, and 100% IP transfer.
Direct Senior Developer Access
Collaborate directly with lead software architect Mr Umer Malik with zero agency middlemen.
High-Availability Spain Cloud
Systems deployed on AWS Frankfurt (eu-central-1) for low latency and compliance with RGPD/GDPR, LOPD, AEPD Registered, ePrivacy.
Phased Delivery Roadmap & How This Project Runs
Structured from initial discovery call to production deployment and 100% intellectual property transfer.
Phase 01: Scoping & Fixed Milestone Scoping
Discovery call to map system boundaries, data models, and agree on fixed milestone pricing in EUR.
Phase 02: Private Repository & Staging Sandbox
GitHub repo setup under your organization, signed mutual NDA, and automated private staging environment.
Phase 03: Agile Sprints & Weekly Working Demos
Daily code commits and weekly staging demo links where you test functional features before sign-off.
Phase 04: Production Launch & 100% IP Handover
Zero-downtime DNS cutover, pre-flight security audit, speed optimization, and 100% credential transfer + 30-day warranty.
Preguntas Frecuentes
Respuestas claras a las consultas más comunes sobre nuestros servicios.
How do you coordinate with business hours in Spain? ▼
Who owns the intellectual property and code repository? ▼
What is the pricing structure in Spain? ▼
Where is client data hosted and is it compliant? ▼
Can you integrate regional payment methods in Spain? ▼
What warranty is provided upon project launch? ▼
Great dreams deserve craftsmanship, not compromises. Let’s build yours.
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© 2026 UMER XPERT. AL SERVICIO DE ESPAÑA — MADRID ✦ BARCELONA. TODOS LOS DERECHOS RESERVADOS.