curl --request POST \
  --url https://nudgen.net/api/v1/contacts/add \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "nathan@example.com",
  "name": "Nathan Nguyen"
}
'

{
  "success": true,
  "contact": {
    "id": "<string>"
  }
}