docs: sync from backend ca2b1c4 — marketplace e2e smoke runner

11 - Testing/Escrow Marketplace E2E Procedure.md

@@ -30,6 +30,20 @@ or scanner changes.
 
 ## High-Level Procedure
 
+Use the implemented backend runner for repeatable execution:
+
+```bash
+BASE_URL=https://dev.amn.gg \
+PAYMENT_MODE=status \
+CONCURRENCY_LEVELS=1 \
+ROUNDS=2 \
+bash scripts/smoke/marketplace-e2e-notifications.sh
+```
+
+Use `PAYMENT_MODE=live` for the funded BSC Testnet tUSDT rail and
+`PAYMENT_MODE=record` only when explicitly testing the legacy marketplace
+payment-record route. See [[Marketplace E2E Smoke Runner]].
+
 1. Generate a run id.
 2. Admin creates one buyer and at least two sellers.
 3. Assert initial notification baselines for buyer and sellers.