curl --request POST \
  --url https://api.vambe.me/api/public/webchat/contact/add-metadata \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --data '
{
  "metadata": {},
  "externalUserId": "<string>"
}
'

const options = {
  method: 'POST',
  headers: {'x-api-key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({metadata: {}, externalUserId: '<string>'})
};

fetch('https://api.vambe.me/api/public/webchat/contact/add-metadata', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.vambe.me/api/public/webchat/contact/add-metadata"

payload = {
    "metadata": {},
    "externalUserId": "<string>"
}
headers = {
    "x-api-key": "<x-api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)