curl --request POST \
  --url https://api.comm.com/api/v1/audience/contacts/tags \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contact_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "tags": [
    "<string>"
  ],
  "truncate": true
}
'

{
  "message": "Tags added"
}