The Project

ProSpeed Racing

Enterprise Automotive eCommerce with Advanced Logistics

Engineered a comprehensive B2B/B2C platform featuring intelligent product bundling, real-time shipping calculations, warehouse management integration, and B2B-specific pricing to handle complex automotive kits and global fulfillment.

The Problem

The Challenges

01

Complex Kit Assembly & Bundling

ProSpeed Racing sells sophisticated automotive kits with hundreds of SKUs that must be bundled together. Standard Shopify product bundles couldn’t handle dynamic pricing, compatibility rules, or the B2B wholesale tier system required for their dealer network.

02

Dynamic Shipping Rate Calculation

Different kits have vastly different dimensions and weights. Shopify’s flat-rate/weight based shipping doesn’t work for automotive parts. Manual quotes were slow and error-prone. Integration with real shipping carriers was essential but complex.

03

Inventory Accuracy Nightmare

ProSpeed operates with incoming/reserved stock. Shopify inventory alone couldn’t prevent overselling or show customers when items would be in stock. Manual syncing from their WMS caused daily discrepancies and lost orders.

04

B2B Pricing & Credit Card Fees

B2B customers pay via credit card but incur processing fees. Shopify has no native way to apply tiered fees based on customer type, order value, or payment method. Custom invoicing and payment terms were completely manual.

The Solution

Solutions Delivered

Challenge 1: Complex Kit Assembly

Solution: Advanced Bundle Builder

What we built:

  • Dynamic kit builder with compatibility rules
  • Real-time price recalculation based on selections
  • Tiered wholesale pricing (dealer vs retail)
  • Minimum/maximum component validation
  • Save kit configurations for repeat orders

Technical approach:

  • Custom Shopify app with product metafields for kit rules
  • Real-time JavaScript pricing engine
  • Customer-specific pricing via customer metafields
  • Custom cart function for dynamic bundle totals

Result:

  • More kit bundle sales
  • Reduced custom quote requests
  • Faster B2B repeat ordering

Challenge 2: Dynamic Shipping Rates

Solution: StarShipIT Integration

What we built:

  • Real-time shipping rate integration with StarShipIT
  • Automatic dimension/weight capture from product metadata
  • Multi-carrier rate shipping (FedEx, UPS, DHL, Direct Freight)
  • Shipping estimate at cart before checkout

Technical approach:

  • StarShipIT API integration via custom Shopify app
  • Dimension & weight stored in product metafields
  • Real-time rate queries using AJAX (sub-second response)

Result:

  • Lower shipping costs
  • Faster checkout experience
  • High inventory accuracy

Challenge 3: Real-Time Inventory Sync

Solution: WMS Integration

What we built:

  • Purchase order integration for incoming stock visibility
  • Allow customer purchases based on PO incoming inventory when out of stock
  • Real-time incoming stock display on PDPs
  • Low stock alerts for B2B customers
  • Automated backorder workflows

Technical approach:

  • WMS webhook integration for inventory events
  • Shopify REST API for inventory updates
  • Custom app for incoming stock metafields
  • Real-time webhook processing (webhook queue)

Result:

  • High inventory accuracy
  • Zero overselling
  • Automated backorder emails

Challenge 4: B2B Pricing & Payment Fees

Solution: Custom Payment Fee App

What we built:

  • Dynamic fee calculation based on customer tier & payment method
  • Automatic fee application at checkout (transparent to customer)
  • B2B net-30 payment terms option
  • Credit card fee pass-through for B2B wholesale
  • Custom invoice generation with payment terms

Technical approach:

  • Custom Shopify app for fee logic
  • Cart transformation using Shopify Functions
  • Customer metafields for tier assignment
  • Payment processor integration for fee pass-through

Result:

  • B2B payment processing fully automated
  • Transparent fee structure eliminates billing disputes
  • Dealer tier pricing management simplified
Technical Details

Technical Highlights

Architecture

  • Modular custom app for bundle builder logic
  • Event-driven inventory sync from WMS
  • Real-time API calls for shipping rates (~500ms average)
  • Webhook-based order automation for fulfillment

Integrations

  • StarShipIT shipping rate API
  • WMS inventory API (bi-directional)
  • Payment processor for fee pass-through
  • Shopify Metafields API (pricing, inventory, dimensions)

Performance

  • Shipping rate lookups respond in 500ms
  • Bundle builder UI updates instantly with JavaScript
  • WMS sync processes 1000+ items in 30 seconds
  • Cart operations optimized for speed (no full page reload)

Reliability & Scale

  • Webhook queue handles inventory surges
  • Fallback pricing if shipping API is unavailable
  • Automatic retry logic for failed integrations
  • Designed for Shopify Plus compliance and scalability

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