diff --git a/src/common/swagger/payment.json b/src/common/swagger/payment.json
index 864e480..a133476 100644
--- a/src/common/swagger/payment.json
+++ b/src/common/swagger/payment.json
@@ -4,6 +4,11 @@
       "post": {
         "summary": "결제 완료 처리",
         "description": "아임포트 imp_uid로 결제 검증 후 DB에 결제 내역, 포인트 거래 내역, 최종 포인트를 저장합니다.",
+        "security": [
+          {
+            "bearerAuth": []
+          }
+        ],
         "tags": ["Payment"],
         "requestBody": {
           "required": true,
@@ -66,6 +71,25 @@
               }
             }
           },
+          "401": {
+            "description": "JWT 인증 실패 (Unauthorized)",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                },
+                "example": {
+                  "resultType": "FAIL",
+                  "error": {
+                    "errorCode": "AUTH001",
+                    "reason": "유효하지 않은 토큰입니다.",
+                    "data": null
+                  },
+                  "success": null
+                }
+              }
+            }
+          },
           "500": {
             "description": "서버 오류",
             "content": {
diff --git a/src/payment/controller/payment.controller.js b/src/payment/controller/payment.controller.js
index f0a8afc..15ef90a 100644
--- a/src/payment/controller/payment.controller.js
+++ b/src/payment/controller/payment.controller.js
@@ -5,19 +5,21 @@ import { PaymentService } from "../service/payment.service.js";
 
 export const paymentConfirm = async (req, res, next) => {
   try {
-      const dto = new CreatePaymentDto({
-        impUid: req.body.impUid,
-        merchantUid: req.body.merchantUid,
-        productId: req.body.productId,
-        userId: req.body.userId,
-      });
+    const userId = req.user.id;
+
+    const dto = new CreatePaymentDto({
+      impUid: req.body.impUid,
+      merchantUid: req.body.merchantUid,
+      productId: req.body.productId,
+      userId: userId,
+    });
 
-      const payment = await PaymentService.createPayment(dto);
-      const responseData = parseWithBigInt(stringifyWithBigInt(payment));
-      res.status(StatusCodes.CREATED).success(responseData);
-    } catch (err) {
-      next(err);
-    }
+    const payment = await PaymentService.createPayment(dto);
+    const responseData = parseWithBigInt(stringifyWithBigInt(payment));
+    res.status(StatusCodes.CREATED).success(responseData);
+  } catch (err) {
+    next(err);
+  }
 }
 
 export const getPayments = async (req, res, next) => {
diff --git a/src/payment/payment.routes.js b/src/payment/payment.routes.js
index 42901e9..4073d6f 100644
--- a/src/payment/payment.routes.js
+++ b/src/payment/payment.routes.js
@@ -6,7 +6,7 @@ import { authenticate } from "../middlewares/auth.middleware.js";
 const router = express.Router();
 
 // 결제 정보 저장 API
-router.post("/complete", paymentConfirm);
+router.post("/complete", authenticate, paymentConfirm);
 
 // 결제 정보 조회 API
 router.get("", authenticate, getPayments);