curl --request POST \
  --url https://realtime.replace-me.example.com/meterreadings-collection:batchAdd \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "timestamp": "2020-01-02T14:00:00.000+0000",
    "value": 10,
    "meterId": 1
  }
]
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify([{timestamp: '2020-01-02T14:00:00.000+0000', value: 10, meterId: 1}])
};

fetch('https://realtime.replace-me.example.com/meterreadings-collection:batchAdd', 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:batchAdd"

payload = [
    {
        "timestamp": "2020-01-02T14:00:00.000+0000",
        "value": 10,
        "meterId": 1
    }
]
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)