solve pydantic deprecation warning

src/main.py

@@ -2,7 +2,7 @@ import os
 import logging
 import secrets
 import requests
-from typing import Annotated, Generator
+from typing import Annotated, Generator, ClassVar
 from fastapi import (
     FastAPI,
     Request,
@@ -13,7 +13,7 @@ from fastapi import (
 from fastapi.background import BackgroundTasks
 from fastapi.responses import RedirectResponse, JSONResponse
 from fastapi.security.api_key import APIKeyHeader
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, ConfigDict
 from psycopg.errors import UniqueViolation
 from sqlalchemy.exc import IntegrityError
 from starlette.status import (
@@ -23,10 +23,10 @@ from starlette.status import (
     HTTP_500_INTERNAL_SERVER_ERROR,
     HTTP_503_SERVICE_UNAVAILABLE)
 from dotenv import load_dotenv
-from src.entity.api.transaction_api import TransactionApi
 from sqlalchemy import text
 from sqlalchemy.orm import Session
 
+from src.entity.api.transaction_api import TransactionApi
 from src.service.fraud_service import check_for_fraud_api
 from src.service.notification_service import send_notification
 from src.repository.common import get_session
@@ -84,8 +84,16 @@ class TransactionProcessingOutput(BaseModel):
     It contains the fraud detection result and the fraud score.
     This class is used as the response model for the /transaction/process endpoint.
     """
-    is_fraud: int = Field(description="The prediction result. 1 if the transaction is detected as fraudulent, 0 otherwise.", example=1)
-    fraud_score: float = Field(description="Probability of transaction being fraudulent.", example=0.85)
+    is_fraud: int = Field(description="The prediction result. 1 if the transaction is detected as fraudulent, 0 otherwise.")
+    fraud_score: float = Field(description="Probability of transaction being fraudulent.")
+
+    model_config: ClassVar[ConfigDict] = ConfigDict(
+        json_schema_extra = {
+            "example": {
+                "is_fraud": 1,
+                "fraud_score": 0.85
+            }
+        })
 
 @app.post("/transaction/process",
           tags=["transaction"],