curl --request PUT \
  --url https://api.emailr.dev/v1/contacts/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "contact@example.com",
  "first_name": "John",
  "last_name": "Doe",
  "subscribed": true,
  "metadata": {
    "source": "website",
    "plan": "pro"
  }
}
'

{
  "id": "123e4567-e89b-12d3-a456-426614174000",
  "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email": "jsmith@example.com",
  "first_name": "<string>",
  "last_name": "<string>",
  "metadata": {},
  "subscribed": true,
  "unsubscribed_at": "2023-11-07T05:31:56Z",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}