Stripe Integration Architecture

This document explains how iaptic's Stripe integration is structured and how the components interact.

System Architecture

flowchart TD
    subgraph Client
        Web[Web App]
        Mobile[Mobile App]
    end

    subgraph Iaptic
        API[API Gateway]
        Validator[Validator]
        Events[Events]
        Cache[Redis Cache]
    end

    subgraph Stripe
        Checkout[Checkout]
        Portal[Customer Portal]
        Webhooks[Webhooks]
    end

    Web --> API
    Mobile --> API
    API --> Validator
    Validator --> Events
    Validator --> Cache
    Validator --> Checkout
    Validator --> Portal
    Webhooks --> Validator

Data Flow

sequenceDiagram
    participant Client
    participant API
    participant Validator
    participant Stripe
    participant Events

    Client->>API: Request
    API->>Validator: Validate
    Validator->>Stripe: Verify
    Stripe-->>Validator: Status
    Validator->>Events: Log
    Validator-->>API: Result
    API-->>Client: Response

Component Roles

Client Application

• Initiates checkout process
• Stores access keys
• Verifies subscription status
• Manages user interface

Iaptic Service

• Generates and validates access keys
• Processes webhook events
• Manages subscription metadata
• Handles user association

Stripe Platform

• Processes payments
• Manages subscriptions
• Sends webhook events
• Stores product data

Data Flow

1. Checkout Flow

sequenceDiagram
    Client->>Iaptic: Create checkout session
    Iaptic->>Iaptic: Generate access key
    Iaptic->>Stripe: Create Stripe session
    Iaptic->>Client: Return session + key
    Client->>Stripe: Complete checkout
    Stripe->>Iaptic: Webhook: checkout.completed
    Iaptic->>Iaptic: Process subscription

2. Subscription Verification

sequenceDiagram
    Client->>Iaptic: Verify with access key
    Iaptic->>Stripe: Check subscription
    Stripe->>Iaptic: Return status
    Iaptic->>Client: Return purchase info

3. Webhook Processing

sequenceDiagram
    Stripe->>Iaptic: Send webhook event
    Iaptic->>Iaptic: Verify signature
    Iaptic->>Stripe: Fetch full data
    Iaptic->>Iaptic: Process event
    Iaptic->>Iaptic: Update state

Security Architecture

Authentication Layers

graph TB
    subgraph Client Layer
        C[Client] -- Access Key --> I[Iaptic API]
    end
    
    subgraph Service Layer
        I -- API Key --> S[Stripe API]
    end
    
    subgraph Webhook Layer
        S -- Signing Secret --> I
    end

Key Management

• Access keys stored client-side
• API keys stored server-side
• Webhook secrets in configuration
• Automatic key rotation

State Management

Data Storage

graph LR
    subgraph Stripe
        S1[Products]
        S2[Subscriptions]
        S3[Customers]
    end
    
    subgraph Iaptic
        I1[Access Keys]
        I2[Metadata]
        I3[Events]
    end
    
    subgraph Client
        C1[Local Storage]
        C2[Session Storage]
    end

Event Processing

1. Webhook reception
2. Signature verification
3. Event validation
4. State update
5. Client notification

Integration Points

Required API Version

All components use Stripe API version 2024-11-20.acacia to ensure:

• Consistent behavior
• Webhook compatibility
• Feature availability

API Endpoints

• /v3/stripe/checkout: Create sessions
• /v3/stripe/purchases: Verify status
• /v3/stripe/portal: Access management
• /v3/stripe/change-plan: Update plans
• /v3/webhook/stripe: Process events

Error Handling

Retry Mechanisms

graph TB
    E[Error] --> R{Retryable?}
    R -- Yes --> B[Backoff]
    R -- No --> F[Fail]
    B --> A[Retry]
    A --> R

Error Categories

1. Validation Errors

   • Invalid access keys
   • Missing metadata
   • Wrong API version

2. Network Errors

   • Webhook timeouts
   • API unavailability
   • Connection issues

3. State Errors

   • Invalid transitions
   • Race conditions
   • Inconsistent data

Scaling Considerations

Rate Limits

• Stripe API limits
• Webhook concurrency
• Client request throttling

Caching Strategy

• Product cache (5 minutes)
• Subscription status (real-time)
• Access key validation (30 seconds)

Performance

• Webhook processing priority
• Asynchronous operations
• Batch processing