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Checkout Service Store Test Plan

Checkout Service Store Test Plan

Disclaimer: This document contains sample content for illustrative purposes only. Organizations should follow their own established best practices, security requirements, and compliance standards to ensure solutions are production-ready.

Checkout Service Store Test Plan

Overview

This test plan covers the comprehensive testing strategy for a Just Walk Out store using credit card entry where Amazon manages the full payment lifecycle through the Checkout Service API. The retailer calculates pricing via the Create Purchases API and submits the priced cart to Amazon for payment processing and receipt generation.

Store Configuration

Attribute	Value
Entry Method	Credit card tap at gate
Identity Verification	Amazon-managed (no retailer F&A integration)
Charge Calculation	Order Delegation via Create Purchases API (incoming from Amazon)
Payment Processing	Retailer calls Amazon via Checkout Service API to charge shopper's payment instrument
Receipt Generation	Amazon-managed
Refunds	Amazon-managed (no retailer API required)
Bad Debt	Amazon-managed (no retailer tracking required)

APIs in Scope

API	Endpoint	Direction	Purpose
Create Purchases	`POST /v1/order/purchases`	Incoming (Amazon → Retailer)	Receive cart and calculate pricing (Order Delegation)
Checkout Cart	`POST /v1/checkout/carts`	Outbound (Retailer → Amazon)	Submit priced cart to Amazon to charge shopper's payment instrument

Test Phases

Phase 1: Unit & Component Testing

1.1 Create Purchases API Testing (Incoming Call)

Duration: 3-5 days
Prerequisites: Ordering Connector deployed and configured

Test Objectives:

Validate cart pricing calculations when Amazon calls your endpoint
Test promotion and tax logic
Verify empty cart handling
Test idempotency with idempotentShoppingTripId (Amazon may retry)
Validate error responses your endpoint returns to Amazon

Key Test Cases:

Single item cart pricing
Multi-item cart with promotions
Weight-based item calculations
Empty cart returns empty purchaseId
Unrecognized SKU routing to bad cart process
API timeout and retry scenarios
Malformed request handling

Success Criteria:

All pricing calculations accurate within 0.01 tolerance
Empty carts return empty purchaseId consistently
Idempotency maintained across duplicate requests from Amazon
Error responses follow documented format (Amazon will retry on 500/503)
Response times under 2 seconds for 95% of requests

1.2 Checkout Service API Testing (Outbound Call)

Duration: 3-5 days
Prerequisites: Create Purchases API validated, Checkout Service configured

Test Objectives:

Validate outbound cart submission to Amazon to charge shopper's payment instrument
Test cart content and totals validation
Verify retry strategy with exponential backoff for 429/503 responses
Test error handling for validation failures

Key Test Cases:

Successful checkout with valid cart
Cart content validation (line items match)
Order totals validation (priceTotal = subTotal - promotions + tax)
Decimal precision validation (2 decimal places)
Empty cart handling (no checkout call)
Payment instrument decline scenarios
Checkout API timeout handling
429 (Too Many Requests) retry with Retry-After header
503 (ServiceUnavailable) retry with retryAfter value
Exponential backoff behavior validation

Success Criteria:

All valid carts processed successfully (201 response)
Cart validation rules enforced correctly
Payment failures handled gracefully
orderId returned for successful transactions
No checkout calls made for empty carts
Retry logic correctly handles 429 and 503 responses
Exponential backoff implemented correctly

Phase 2: Integration Testing

2.1 End-to-End Shopping Journey

Duration: 5-7 days
Prerequisites: All component tests passed

Test Scenarios:

Scenario 1: Successful Shopping Trip

Shopper taps credit card at gate
Amazon verifies payment instrument and places pre-auth
Gate opens, shopper enters store
Shopper picks up items (tracked by Amazon)
Shopper exits store
Amazon calls Create Purchases API with cart (incoming)
Retailer calculates pricing and returns purchaseId
Retailer calls Checkout Service API with priced cart (outbound) to charge shopper's payment instrument
Amazon validates cart, charges payment instrument
Amazon returns orderId (201)
Amazon generates and delivers receipt to shopper

Scenario 2: Empty Cart Journey

Shopper taps credit card at gate
Pre-auth placed, gate opens
Shopper enters but takes no items
Shopper exits store
Amazon calls Create Purchases API with empty cart (incoming)
Retailer returns empty purchaseId
No outbound Checkout Service API call made
Amazon cancels pre-auth automatically

Scenario 3: Payment Decline Scenario

Normal shopping journey through cart calculation
Retailer submits cart to Checkout Service (outbound)
Amazon attempts payment but card is declined
Checkout Service returns payment failure
Retailer retries with exponential backoff if applicable (429/503)
If terminal failure, retailer logs error — Amazon handles bad debt

Success Criteria:

100% success rate for valid shopping journeys
Empty carts handled without checkout calls
Payment declines handled gracefully with appropriate retry logic
All transactions properly logged and tracked
Receipt delivery successful (Amazon-managed)

2.2 Retry and Error Handling Integration

Duration: 2-3 days
Prerequisites: End-to-end flow validated

Test Objectives:

Validate incoming call error handling (Create Purchases)
Validate outbound call retry logic (Checkout Service)
Verify system behavior under failure conditions

Test Cases:

Create Purchases endpoint returns 500 → verify Amazon retries with same idempotentShoppingTripId
Create Purchases endpoint returns 503 → verify Amazon retries
Checkout Service returns 429 → verify retailer retries with Retry-After header
Checkout Service returns 503 → verify retailer retries with retryAfter value
Checkout Service returns 400 → verify retailer does NOT retry (terminal error)
Network timeout on outbound Checkout Service call → verify retry behavior
Multiple concurrent retries for same shopping trip → verify idempotency

Success Criteria:

Incoming call idempotency maintained across Amazon retries
Outbound retry logic follows exponential backoff
Terminal errors (400) not retried
Retryable errors (429, 503) retried with correct backoff
Alerts triggered when max retries exhausted

2.3 Cart Validation Integration

Duration: 3-4 days
Prerequisites: End-to-end flow validated

Test Objectives:

Validate Amazon's cart validation rules
Test edge cases and boundary conditions
Verify error handling for validation failures

Test Cases:

Cart content mismatch (items don't match original cart)
Order totals mismatch (incorrect calculations)
Missing required fields in checkout payload
Invalid decimal precision
Large cart processing (100+ items)
Concurrent checkout attempts

Success Criteria:

All validation rules enforced correctly
Clear error messages for validation failures
System handles large carts efficiently
Concurrent requests processed safely

Phase 3: Performance & Load Testing

3.1 API Performance Testing

Duration: 3-4 days
Prerequisites: Integration testing completed

Load Scenarios:

Normal Load:

10 concurrent shoppers
1 transaction per minute per shopper
4-hour sustained test

Peak Load:

50 concurrent shoppers
2 transactions per minute per shopper
1-hour sustained test

Burst Load:

100 concurrent checkout requests
5-minute burst test

Performance Targets:

Create Purchases API (incoming): < 2 seconds (95th percentile)
Checkout Service API (outbound): < 5 seconds (95th percentile)
System availability: > 99.9% during test period

3.2 Scalability Testing

Duration: 2-3 days
Prerequisites: Performance baselines established

Test Objectives:

Determine maximum concurrent capacity
Identify bottlenecks and failure points
Validate auto-scaling behavior

Test Method:

Gradually increase load from 10 to 200 concurrent users
Monitor response times and error rates
Identify breaking point and degradation patterns

Success Criteria:

System handles target load without degradation
Auto-scaling triggers appropriately
Graceful degradation under extreme load
No data loss or corruption under stress

Phase 4: Security & Compliance Testing

4.1 Authentication & Authorization

Duration: 2-3 days
Prerequisites: All APIs configured with security

Test Cases:

Valid IAM role authentication
Invalid/expired credentials rejection
API Gateway security configuration
Rate limiting enforcement
HTTPS/TLS validation

Success Criteria:

All unauthorized requests rejected (401/403)
Rate limiting prevents abuse
All data transmitted securely
Security logs capture all events

4.2 Data Protection Testing

Duration: 2-3 days
Prerequisites: Security infrastructure deployed

Test Objectives:

Validate PCI DSS compliance (Amazon-managed)
Test data encryption in transit
Verify audit logging completeness

Test Cases:

Payment data encryption validation
Audit trail completeness
Data retention policy compliance
Privacy regulation compliance (GDPR, CCPA)

Success Criteria:

All payment data properly encrypted
Complete audit trail maintained
Compliance requirements met
No sensitive data exposed in logs

Phase 5: Operational Readiness Testing

5.1 Monitoring & Alerting

Duration: 3-4 days
Prerequisites: Monitoring infrastructure deployed

Test Objectives:

Validate monitoring coverage
Test alerting thresholds and escalation
Verify dashboard accuracy

Test Cases:

API response time monitoring
Error rate alerting
Payment failure notifications
System health checks
Business metrics tracking

Success Criteria:

All critical metrics monitored
Alerts trigger within SLA (< 5 minutes)
Dashboards provide actionable insights
Escalation procedures tested

5.2 Incident Management Testing

Duration: 2-3 days
Prerequisites: Monitoring and alerting validated

Test Objectives:

Validate incident detection and classification
Test escalation procedures and communication plans
Verify coordination with Amazon during cross-system incidents
Confirm post-incident review process

Test Scenarios:

Simulate Create Purchases endpoint failure → verify incident detection, classification, and alerting
Simulate Checkout Service outbound call failures → verify escalation triggers
Simulate sustained 429 responses from Checkout Service → verify on-call notification and Amazon coordination
Simulate complete API Gateway failure → verify war room activation and communication plan
Conduct tabletop exercise for major incident affecting shopper experience

Success Criteria:

Incidents detected within SLA (< 5 minutes)
Correct severity classification applied
Escalation procedures followed correctly
Communication plan executed (internal stakeholders, store operations, Amazon team)
Incident timeline tracked (detection, acknowledgment, mitigation, resolution)
Post-incident review conducted with root cause and corrective actions documented
MTTD and MTTR metrics captured

5.3 Disaster Recovery Testing

Duration: 2-3 days
Prerequisites: DR procedures documented

Test Scenarios:

API Gateway failure simulation
Database connectivity loss
Network partition scenarios
Service degradation handling

Success Criteria:

System fails gracefully
Recovery procedures effective
Data integrity maintained
RTO/RPO targets met

Test Environment Requirements

Infrastructure

API Gateway: Configured with rate limiting and authentication
Compute Resources: Auto-scaling groups for APIs
Database: Primary and backup instances
Monitoring: CloudWatch, application monitoring tools
Load Balancer: Health checks and failover configured

Test Data

Valid Store Configuration: Store ID, catalog data
Test Payment Instruments: Valid and invalid credit cards
Product Catalog: Diverse SKUs with various pricing models
Test Shoppers: Different shopper profiles for testing

Tools & Frameworks

API Testing: Postman, Newman, or similar
Load Testing: JMeter, Artillery, or k6
Monitoring: CloudWatch, Datadog, or New Relic
Security Testing: OWASP ZAP, Burp Suite

Test Data Management

Catalog Data Requirements

{
  "testCatalog": {
    "regularItems": [
      {"sku": "TEST-001", "price": 9.99, "name": "Test Item 1"},
      {"sku": "TEST-002", "price": 15.50, "name": "Test Item 2"}
    ],
    "promotionalItems": [
      {"sku": "PROMO-001", "price": 12.99, "promotion": "20% off"}
    ],
    "weightBasedItems": [
      {"sku": "WEIGHT-001", "pricePerLb": 3.99, "name": "Test Produce"}
    ],
    "unknownSkus": [
      {"sku": "UNKNOWN-001", "expectedBehavior": "badCartProcess"}
    ]
  }
}

Test Payment Instruments

Valid Cards: Test credit/debit cards that process successfully
Declined Cards: Cards that simulate payment failures
Expired Cards: Cards that simulate expiration scenarios

Success Criteria & Exit Criteria

Phase Exit Criteria

Unit Testing:

100% of test cases pass
Code coverage > 80%
No critical or high severity defects

Integration Testing:

End-to-end scenarios complete successfully
All API integrations validated
Performance within acceptable limits

Load Testing:

Target load handled without degradation
Scalability requirements met
No data loss under stress

Security Testing:

All security requirements validated
Compliance standards met
Vulnerability assessment passed

Operational Readiness:

Monitoring and alerting functional
Disaster recovery procedures validated
Documentation complete

Overall Success Criteria

All test phases completed successfully
System meets functional requirements
Performance targets achieved
Security and compliance validated
Operational procedures tested
Go-live readiness confirmed

Risk Mitigation

High-Risk Areas

Cart Validation Logic: Complex validation rules between retailer and Amazon
Payment Processing: Amazon-managed payment failures
Empty Cart Handling: Coordination between APIs for pre-auth cancellation
Performance Under Load: Checkout Service API response times

Mitigation Strategies

Extensive Validation Testing: Comprehensive test cases for all validation rules
Payment Failure Simulation: Test all decline scenarios and error handling
Empty Cart Automation: Automated testing of empty cart workflows
Performance Monitoring: Continuous monitoring during load tests

Test Schedule

Phase	Duration	Dependencies	Resources
Unit Testing	6-10 days	APIs deployed	2-3 developers, 1 QA
Integration Testing	10-14 days	Unit tests passed	2 QA engineers, 1 developer
Performance Testing	5-7 days	Integration complete	1 performance engineer, 1 QA
Security Testing	4-6 days	Performance baseline	1 security engineer, 1 QA
Operational Testing	7-10 days	Security validated	1 DevOps engineer, 1 QA
Total	32-47 days		6-8 team members

Deliverables

Test Documentation

Test case execution reports
Performance test results and analysis
Security assessment report
Defect reports and resolution status
Test environment configuration guide

Checkout Service Store Test Plan

Checkout Service Store Test Plan

Overview

Store Configuration

APIs in Scope

Test Phases

Phase 1: Unit & Component Testing

1.1 Create Purchases API Testing (Incoming Call)

1.2 Checkout Service API Testing (Outbound Call)

Phase 2: Integration Testing

2.1 End-to-End Shopping Journey

2.2 Retry and Error Handling Integration

2.3 Cart Validation Integration

Phase 3: Performance & Load Testing

3.1 API Performance Testing

3.2 Scalability Testing

Phase 4: Security & Compliance Testing

4.1 Authentication & Authorization

4.2 Data Protection Testing

Phase 5: Operational Readiness Testing

5.1 Monitoring & Alerting

5.2 Incident Management Testing

5.3 Disaster Recovery Testing

Test Environment Requirements

Infrastructure

Test Data

Tools & Frameworks

Test Data Management

Catalog Data Requirements

Test Payment Instruments

Success Criteria & Exit Criteria

Phase Exit Criteria

Overall Success Criteria

Risk Mitigation

High-Risk Areas

Mitigation Strategies

Test Schedule

Deliverables

Test Documentation

Operational Documentation

Code Artifacts

Appendix

Test Case References

Related Documentation