curl --request POST \
  --url https://realtime.replace-me.example.com/meterreadings-collection:batchUpdate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "1001": {
    "value": 26
  },
  "1002": {
    "value": 27
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({'1001': {value: 26}, '1002': {value: 27}})
};

fetch('https://realtime.replace-me.example.com/meterreadings-collection:batchUpdate', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://realtime.replace-me.example.com/meterreadings-collection:batchUpdate"

payload = {
    "1001": { "value": 26 },
    "1002": { "value": 27 }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)