docs: sync from backend 3e9a2f2 — BSC Testnet tUSDT rail

08 - Operations/Scanner Operations.md

@@ -151,6 +151,14 @@ Edit `tokens.json`. Each entry:
 
 Token registry is used only for populating `tokenSymbol` and `decimals` in the `checkoutBlock` response. Omitting a token does not break scanning — it just leaves those fields empty.
 
+For dev BSC Testnet, chain `97` symbol `USDT` must point at the deployed tUSDT contract:
+
+```json
+{ "chainId": 97, "address": "0x109F54Dab34426D5477986b0460aE5dFBA65f022", "symbol": "USDT", "decimals": 18, "name": "Test USDT (BSC Testnet)" }
+```
+
+After a registry change, restart/redeploy the scanner and verify through `POST /balances/check` by symbol, not only by explicit `tokenAddress`.
+
 ---
 
 ## 7. Manual webhook retry