Route payments across Stripe, PayPal, and Adyen by fees and availability

## Multi-Provider Payment Routing Engine Receives a payment request, evaluates providers on fees, currency support and live availability, selects the optimal provider using a weighted score, routes the payment, and returns a full decision + audit trail. ### All nodes (1-line each) 1. Webhook - Payment Route Request – Receives the payment routing request via POST. 2. Code - Validate & Load Providers – Validates the request and loads provider catalog (fees, currencies, base scores). 3. Wait - Pre Provider Check 1 – Short pause before first provider availability check. 4. HTTP Request - Check Provider A – Queries live availability / health of Provider A. 5. Wait - Pre Provider Check 2 – Pause before second provider availability check. 6. HTTP Request - Check Provider B – Queries live availability / health of Provider B. 7. Wait - Pre Provider Check 3 – Pause before third provider availability check. 8. HTTP Request - Check Provider C – Queries live availability / health of Provider C. 9. HTTP Request - Route to Selected Provider – Forwards the payment to the winning provider. 10. Code - Build Routing Decision – Aggregates scores, availability and fees into final provider selection + audit trail. 11. Respond to Webhook – Returns the complete routing decision to the caller.