CASE STUDY

MULTI-VENDOR
MARKETPLACE
180+ API INTEGRATIONS

FOR AN E-COMMERCE COMPANY

MARKETPLACE API TESTING
ABOUT CLIENT
ABOUT CLIENT
ABOUT CLIENT
ABOUT CLIENT

B2B marketplace with 180+ vendor APIs for catalogs, inventory, pricing, and orders. The platform connects multiple vendors to enable seamless business transactions and order processing.

The marketplace required reliable API integrations to maintain vendor relationships and ensure smooth order fulfillment across a complex ecosystem of partners.

MARKETPLACE API TESTING
CHALLENGE
CHALLENGE
CHALLENGE
CHALLENGE
CHALLENGE

23% daily API failures, 12 vendors threatening to leave. Largest vendor (28% revenue) gave 60-day ultimatum.

23% vendor APIs failing daily

Causing order delays and customer frustration across the platform.

Inventory sync errors

Overselling issues and inventory discrepancies creating operational problems.

8-12 hour order confirmation delays

Slow API responses affecting customer experience and vendor relationships.

Pricing updates not propagating correctly

Inconsistent pricing data across vendor integrations.

Vendor onboarding: 3+ weeks manual testing

Slow onboarding process preventing marketplace growth.

No monitoring or alerting for API failures

Lack of visibility into API health and performance issues.

MARKETPLACE API TESTING
SOLUTION
SOLUTION
SOLUTION
SOLUTION

Implementation

6-person API testing team:

Automated Test Suite

Framework: RestAssured, Postman/Newman. 850+ scenarios across 180 vendors (catalog, inventory, pricing, orders). Data-driven, parameterized tests for edge cases.

Contract Testing

Consumer-driven contracts (Pact), API versioning and backward compatibility, validation pipeline preventing breakage.

Monitoring & Alerting

24/7 monitoring (Datadog), synthetic tests every 5 min, real-time dashboards: availability, response times, errors. Smart alerts, vendor health scorecards.

Quality Gates

Vendor onboarding certification process, self-service testing portal for vendors, troubleshooting guides (67% fewer support tickets).

CI/CD Integration

Auto-execution on deployments, smoke tests post-deploy, nightly regression across all 180 APIs, rollback automation.

Tools

RestAssured Postman/Newman Pact SoapUI Datadog Jenkins Python Java Grafana Docker
MARKETPLACE API TESTING
RESULTS
RESULTS
RESULTS
RESULTS
99.8%
API Reliability Achieved
91%
Reduction in Order Errors
3w → 4d
Vendor Onboarding Time
850+
Automated API Tests

Key Achievements:

  • API reliability improved to 99.8% – From 77% reliability to 99.8%, eliminating daily integration failures
  • Order processing errors reduced 91% – Near-elimination of failed orders and inventory sync issues
  • Vendor onboarding time cut from 3 weeks to 4 days – Automated testing and self-service portal accelerated onboarding by 81%
  • 850+ automated API test scenarios – Comprehensive coverage across all vendor integrations running continuously
  • Real-time monitoring of 180+ vendors – 24/7 health monitoring with proactive alerting preventing outages
  • Zero vendor departures – All 12 vendors threatening to leave stayed due to reliability improvements
  • 45 new vendors onboarded – Faster onboarding enabled rapid marketplace expansion
  • 67% reduction in support tickets – Self-service vendor portal and better documentation reduced support load
MARKETPLACE API TESTING
SUMMARY
SUMMARY
SUMMARY
SUMMARY

Business value

  • Automated API testing suite with contract testing and continuous monitoring achieved 99.8% API reliability
  • Reduced vendor onboarding from 3 weeks to 4 days, enabling rapid marketplace growth
  • Eliminated vendor churn and restored confidence in platform reliability

Need Reliable API Integration Testing?

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