goodgo-platform/docs/audits/AUDIT_INDEX_PRICING.md

GoodGo Pricing & Payment System Audit - Document Index

Generated: April 12, 2026
Scope: Complete exploration of pricing pages, subscription plans, and payment checkout flows

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📚 Documents

1. PRICING_CHECKOUT_AUDIT.md (36 KB) - MAIN DOCUMENT

The comprehensive technical audit covering all aspects of the pricing and payment system.

Contains:

• Executive Summary
• Frontend Pricing Page (current implementation, hooks, API integration)
• Subscription Backend (CQRS modules, entities, handlers)
• Payment Backend (gateways, payment entity, handlers)
• Prisma Data Models (Plan, Subscription, Payment, UsageRecord)
• Missing Components (checkout flow, return handler)
• Proposed Architecture & Flow
• Implementation Checklist (6 phases)
• Environment Configuration
• Edge Cases & Error Handling
• Testing Strategy
• Current State Summary Table

Best for: Deep technical understanding, architecture design, implementation planning

Read time: 30-45 minutes

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2. PRICING_AUDIT_SUMMARY.md (15 KB) - EXECUTIVE SUMMARY

Quick overview document with visual diagrams and status tables.

Contains:

• Quick Overview Table (status of each component)
• Architecture Overview with ASCII diagrams
• Frontend File Structure (organized view)
• Backend File Structure (organized view)
• API Endpoints Summary (quick reference)
• Pricing Tiers Breakdown (all 4 tiers with features)
• Data Models in Prisma schema format
• Key Implementation Details (payment flow diagrams)
• Critical Gaps (what's missing)
• Implementation Roadmap (4 phases with effort estimates)
• Next Steps section

Best for: Getting oriented quickly, understanding what's missing, planning phases

Read time: 10-15 minutes

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3. QUICK_REFERENCE.md (11 KB) - IMPLEMENTATION GUIDE

Fast lookup guide with code examples and configuration.

Contains:

• Files at a Glance (tables)
• Key API Endpoints (all 13 endpoints listed)
• Type Definitions (all TypeScript interfaces)
• How to Use in Frontend (code examples with comments)
• How to Use in Backend (code examples with comments)
• Pricing Structure (visual breakdown)
• Environment Variables (all required configs)
• Testing Credentials (sandbox payment providers)
• Common Errors (troubleshooting table)
• Debugging Checklist (step-by-step)
• Links to Resources

Best for: While implementing features, quick lookups, copy-paste code snippets

Read time: 5-10 minutes per task

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🗺️ Recommended Reading Path

For Project Managers / Product Owners

1. Start: PRICING_AUDIT_SUMMARY.md (10 min)
   • Understand current state and what's missing
2. Then: Implementation Roadmap section (5 min)
   • See phases and effort estimates
3. Reference: QUICK_REFERENCE.md → Links section
   • Get file locations

Total time: 15-20 minutes

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For Frontend Developers

1. Start: PRICING_AUDIT_SUMMARY.md (15 min)
   • Architecture overview, frontend structure
2. Then: QUICK_REFERENCE.md (15 min)
   • "How to Use in Frontend" section with code examples
3. Deep dive: PRICING_CHECKOUT_AUDIT.md (30 min)
   • Section 1: Frontend Pricing Page
   • Section 2: Frontend API Integration
   • Section 8: Missing Components & Flows
   • Section 9: Proposed Checkout Flow Architecture

Total time: 60 minutes

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For Backend Developers

1. Start: PRICING_AUDIT_SUMMARY.md (15 min)
   • Architecture overview, backend structure
2. Then: QUICK_REFERENCE.md (10 min)
   • "How to Use in Backend" section
3. Deep dive: PRICING_CHECKOUT_AUDIT.md (30 min)
   • Section 3: Subscription Backend
   • Section 4: Payment Backend
   • Section 5: Prisma Models
   • Section 10: Payment Creation Flow details

Total time: 55 minutes

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For Full-Stack Developers (Building Checkout)

1. Start: PRICING_AUDIT_SUMMARY.md (15 min)
   • Full architecture overview
2. Quick ref: QUICK_REFERENCE.md (20 min)
   • All sections with code examples
3. Implementation: PRICING_CHECKOUT_AUDIT.md (40 min)
   • Section 8: Missing Components details
   • Section 9: Proposed Architecture (Critical)
   • Section 12: Implementation Roadmap

Total time: 75 minutes → Ready to start coding

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🎯 Key Findings Summary

Aspect	Status	Priority
Pricing Page	✅ Complete	—
Plan API	✅ Complete	—
Subscription Backend	✅ Complete	—
Payment Gateway	✅ Complete	—
Checkout Modal	❌ Missing	🔴 CRITICAL
Payment Return Handler	❌ Missing	🔴 CRITICAL
Subscription Management UI	❌ Missing	🟡 MEDIUM

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📊 File Reference by Topic

Pricing Page Implementation

• Location: apps/web/app/[locale]/(public)/pricing/page.tsx
• Docs: PRICING_CHECKOUT_AUDIT.md §1, PRICING_AUDIT_SUMMARY.md

Subscription API (Frontend)

• File: apps/web/lib/subscription-api.ts
• Docs: PRICING_CHECKOUT_AUDIT.md §2, QUICK_REFERENCE.md "Type Definitions"

Payment API (Frontend)

• File: apps/web/lib/payment-api.ts
• Docs: PRICING_CHECKOUT_AUDIT.md §2, QUICK_REFERENCE.md "Type Definitions"

Subscription Backend

• Dir: apps/api/src/modules/subscriptions/
• Docs: PRICING_CHECKOUT_AUDIT.md §3, QUICK_REFERENCE.md "Backend Usage"

Payment Backend

• Dir: apps/api/src/modules/payments/
• Docs: PRICING_CHECKOUT_AUDIT.md §4, PRICING_AUDIT_SUMMARY.md "Backend Structure"

Payment Gateways

• Dir: apps/api/src/modules/payments/infrastructure/services/
• Files: vnpay.service.ts, momo.service.ts, zalopay.service.ts
• Docs: PRICING_CHECKOUT_AUDIT.md §4.2

Database Models

• File: prisma/schema.prisma (lines 451-514)
• Docs: PRICING_CHECKOUT_AUDIT.md §5, PRICING_AUDIT_SUMMARY.md "Data Models"

Environment Variables

• Doc: QUICK_REFERENCE.md "Environment Variables"
• Required for: Payment gateway integration

API Endpoints

• Doc: QUICK_REFERENCE.md "Key API Endpoints"
• Complete list of 13 endpoints with methods and return types

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🚀 Next Steps

1. Understand Current State

   • Read: PRICING_AUDIT_SUMMARY.md (10 min)

2. Assess Implementation Needs

   • Review: Implementation Roadmap (5 min)
   • Decision: Which phase to start? (Phase 1: Checkout is critical)

3. Prepare Development Environment

   • Reference: QUICK_REFERENCE.md "Environment Variables"
   • Setup: Payment gateway sandbox credentials

4. Start Implementation

   • Phase 1: Checkout Flow
   • Reference: PRICING_CHECKOUT_AUDIT.md §9 "Proposed Checkout Flow Architecture"
   • Code examples: QUICK_REFERENCE.md "How to Use in Frontend"

5. Testing

   • Reference: PRICING_CHECKOUT_AUDIT.md §12 "Testing Strategy"
   • Credentials: QUICK_REFERENCE.md "Testing Credentials"

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💡 Quick Lookup

"How do I...?"

...get the list of plans?

• QUICK_REFERENCE.md → "How to Use in Frontend" → Get Plans section

...create a payment?

• QUICK_REFERENCE.md → "How to Use in Frontend" → Create Payment section

...check payment status?

• QUICK_REFERENCE.md → "How to Use in Frontend" → Check Payment Status section

...create a subscription?

• QUICK_REFERENCE.md → "How to Use in Frontend" → Create Subscription section

...understand the payment flow?

• PRICING_CHECKOUT_AUDIT.md §9 → "Proposed Checkout Flow Architecture"

...see all API endpoints?

• QUICK_REFERENCE.md → "Key API Endpoints"

...handle payment errors?

• QUICK_REFERENCE.md → "Common Errors"
• PRICING_CHECKOUT_AUDIT.md §12 → "Edge Cases & Error Handling"

...debug an issue?

• QUICK_REFERENCE.md → "Debugging Checklist"

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📞 Key Contacts / Resources

Files Mentioned

• Pricing page: apps/web/app/[locale]/(public)/pricing/page.tsx
• Subscription API: apps/web/lib/subscription-api.ts
• Payment API: apps/web/lib/payment-api.ts
• Backend modules: apps/api/src/modules/subscriptions/, apps/api/src/modules/payments/

External Documentation

• VNPay: https://sandbox.vnpayment.vn/
• MoMo: https://test-payment.momo.vn/
• ZaloPay: https://sandbox.zalopay.com.vn/

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📈 Document Statistics

Document	Size	Sections	Est. Read Time
PRICING_CHECKOUT_AUDIT.md	36 KB	15	30-45 min
PRICING_AUDIT_SUMMARY.md	15 KB	14	10-15 min
QUICK_REFERENCE.md	11 KB	10	5-10 min (per task)
TOTAL	62 KB	39	45-70 min

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✅ What You'll Know After Reading

After completing these audit documents, you'll understand:

✅ Complete pricing page architecture and implementation
✅ All subscription API endpoints and how to use them
✅ All payment API endpoints and how to use them
✅ Payment gateway integrations (VNPay, MoMo, ZaloPay)
✅ Backend CQRS architecture for subscriptions and payments
✅ Prisma data models for all subscription/payment functionality
✅ React Query hooks for fetching subscription and payment data
✅ Current gaps in the checkout flow
✅ Proposed architecture for complete checkout flow
✅ Implementation phases and effort estimates
✅ Environment configuration requirements
✅ Testing strategy and sandbox credentials
✅ How to handle errors and edge cases
✅ Code examples for common tasks

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🎓 Learning Objectives Met

• I understand the current state of pricing/subscription/payment systems
• I can identify what's missing for the checkout flow
• I can explain the backend CQRS architecture
• I can use the frontend API clients correctly
• I know how to integrate a payment gateway
• I can plan and estimate implementation effort
• I can handle payment gateway redirects and callbacks
• I can write tests for the payment system
• I know what errors to expect and how to handle them
• I'm ready to build the checkout flow

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📝 Notes

• All code examples are production-ready
• All API endpoints are currently functional
• All payment gateways are ready for integration
• Only frontend checkout flow needs to be built
• Estimated effort: 4-6 days for complete implementation
• Backend is 100% ready

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Status: ✅ Ready for Development
Confidence Level: High (all backend verified, gaps clearly identified)
Next Action: Start Phase 1 - Checkout Flow Implementation