a2a-Market Stripe Payment

Create the Stripe payment integration skeleton for order settlement.

Current status: registration scaffold with stable payment contracts and webhook map.

Scope

• Create payment intent from negotiated order terms.
• Capture or cancel payments based on order transitions.
• Reconcile webhook events with internal order state.

Suggested Project Layout

• app/integrations/stripe/stripe_client.py
• app/application/services/payment_service.py
• app/interfaces/api/payment_routes.py
• app/infrastructure/tasks/stripe_webhook_worker.py