Payment with Webhook (Sequence)

Async payment confirmation via a provider webhook.

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sequenceDiagram
    autonumber
    actor U as User
    participant A as App
    participant P as Payment Provider
    U->>A: Place order
    A->>P: Create payment intent
    P-->>A: client_secret
    A-->>U: Show payment form
    U->>P: Submit card details
    P-->>U: 3-D Secure (if needed)
    P->>A: Webhook: payment_succeeded
    A->>A: Mark order paid
    A-->>U: Order confirmed