curl --request POST \
  --url https://api.open.cx/teams/{teamId}/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "userId": 123,
  "groupId": "<string>"
}
'

{
  "statusCode": 123,
  "message": "<string>",
  "error": "<string>"
}