Problem with POST'ing BillExpenseItems

py

import os
import json
import requests
import logging

logging.basicConfig(level=logging.INFO)
log = logging.getLogger(__name__)

url = "http://0ba03adb.ngrok.io/api.rsc/BillExpenseItems" 

body = {
        "ExpenseLineId": "21",
        "ExpenseAccountId": "6001", 
        "ExpenseAmount": "10.00",
        "VendorID": "800002CA-1464931068",       
        }
        
headers = {"Content-Type": "application/json",
           "x-cdata-authtoken": os.getenv('CDATA_TOKEN')}

resp = requests.post(url, json.dumps(body), headers=headers)


log.info(resp.json())
log.info(resp.status_code)


Returns:

INFO:requests.packages.urllib3.connectionpool:Starting new HTTP connection (1): 0ba03adb.ngrok.io
INFO:__main__:{'error': {'message': 'Required field Vendor not specified.', 'code': 'ExecuteOData'}}
INFO:__main__:400