diff --git a/examples/rest-v5-private.ts b/examples/rest-v5-private.ts
index bc66ec1..c38701d 100644
--- a/examples/rest-v5-private.ts
+++ b/examples/rest-v5-private.ts
@@ -7,20 +7,38 @@ const key = process.env.API_KEY_COM;
 const secret = process.env.API_SECRET_COM;
 
 const client = new RestClientV5({
-  key,
-  secret,
-  strict_param_validation: true,
+  key: key,
+  secret: secret,
 });
 
 (async () => {
   try {
-    /** Simple example for a private REST API call with bybit's V5 REST APIs */
+    /** Simple examples for private REST API calls with bybit's V5 REST APIs */
     const response = await client.getPositionInfo({
       category: 'option',
       symbol: 'BTCUSDT',
     });
 
     console.log('response:', response);
+
+    // Trade USDT linear perps
+    const buyOrderResult = await client.submitOrder({
+      category: 'linear',
+      symbol: 'BTCUSDT',
+      orderType: 'Market',
+      qty: '1',
+      side: 'Buy',
+    });
+    console.log('buyOrderResult:', buyOrderResult);
+
+    const sellOrderResult = await client.submitOrder({
+      category: 'linear',
+      symbol: 'BTCUSDT',
+      orderType: 'Market',
+      qty: '1',
+      side: 'Sell',
+    });
+    console.log('sellOrderResult:', sellOrderResult);
   } catch (e) {
     console.error('request failed: ', e);
   }
diff --git a/src/constants/enum.ts b/src/constants/enum.ts
index 8ea22a0..8ade830 100644
--- a/src/constants/enum.ts
+++ b/src/constants/enum.ts
@@ -78,6 +78,7 @@ export const API_ERROR_CODE = {
   SUB_USER_NOT_FOUND: 141009,
   SPOT_LEVERAGE_TOKEN_INSUFFICIENT_BALANCE: 175006,
   SPOT_LEVERAGE_TOKEN_ORDER_NOT_FOUND: 175007,
+  SPOT_LEVERAGE_QUIZ_REQUIRED: 175010,
   SPOT_MARGIN_NOT_ENABLED: 176008,
   SPOT_MARGIN_QUESTIONNAIRE_NOT_SUBMIT: 176037,
   /** E.g. USDC Options trading, trying to access a symbol that is no longer active */
diff --git a/src/types/request/v5-spot-leverage-token.ts b/src/types/request/v5-spot-leverage-token.ts
index 189f5fd..b60e306 100644
--- a/src/types/request/v5-spot-leverage-token.ts
+++ b/src/types/request/v5-spot-leverage-token.ts
@@ -2,7 +2,7 @@ import { LTOrderTypeV5 } from '../v5-shared';
 
 export interface PurchaseSpotLeveragedTokenParamsV5 {
   ltCoin: string;
-  ltAmount: string;
+  amount: string;
   serialNo?: string;
 }
 
diff --git a/test/v5/private.write.test.ts b/test/v5/private.write.test.ts
index 8e56efc..cd3b958 100644
--- a/test/v5/private.write.test.ts
+++ b/test/v5/private.write.test.ts
@@ -416,17 +416,16 @@ describe('Private WRITE V5 REST API Endpoints', () => {
       leverageToken = tokenResult.result.list[0];
     });
 
-    // Still failing - in contact with bybit
-    it.skip('purchaseSpotLeveragedToken()', async () => {
+    it('purchaseSpotLeveragedToken()', async () => {
       expect(
         await api.purchaseSpotLeveragedToken({
-          ltAmount: '100',
+          amount: '100',
           ltCoin: leverageToken.ltCoin,
         })
       ).toMatchObject({
         // ...successResponseObjectV3(),
-        retCode: API_ERROR_CODE.SPOT_LEVERAGE_TOKEN_INSUFFICIENT_BALANCE,
-        retMsg: '',
+        retCode: API_ERROR_CODE.SPOT_LEVERAGE_QUIZ_REQUIRED,
+        // retMsg: '',
       });
     });