flowchart TD
    subgraph Client
        A[User submits payment request]
    end
 
    subgraph Backend (Node.js)
        B[API Route: /api/payment]
        C[Process Payment Request]
        D{Choose Payment Provider}
        E1[Call Stripe API]
        E2[Call PayPal API]
        F[Save Transaction to DB]
        G[Return Payment Result]
        H[API Route: /api/payout]
        I[Validate Payout Request]
        J[Call PayPal Payout API]
        K[Save Payout to DB]
        L[Return Payout Result]
    end
 
    subgraph DB
        M[Transaction Table]
    end
 
    A --> B
    B --> C
    C --> D
    D -- Stripe --> E1
    D -- PayPal --> E2
    E1 --> F
    E2 --> F
    F --> M
    M --> G
    G --> A
 
    A --> H
    H --> I
    I --> J
    J --> K
    K --> M
    M --> L
    L --> A