curl --request POST \
  --url https://app.fliqr.ai/api/contacts/{contact_id}/tags/{tag_id} \
  --header 'X-ACCESS-TOKEN: <api-key>'

const options = {method: 'POST', headers: {'X-ACCESS-TOKEN': '<api-key>'}};

fetch('https://app.fliqr.ai/api/contacts/{contact_id}/tags/{tag_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://app.fliqr.ai/api/contacts/{contact_id}/tags/{tag_id}"

headers = {"X-ACCESS-TOKEN": "<api-key>"}

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

print(response.text)

{
  "success": true
}