curl --request GET \
  --url https://api-v2.missioninbox.com/users/{id}/

{
  "id": 123,
  "username": "<string>",
  "email": "jsmith@example.com",
  "first_name": "<string>",
  "last_name": "<string>",
  "ips": 123,
  "projects": 123,
  "domains": 123,
  "mailboxes": 123,
  "mailboxes_limit": 123,
  "email_usage": 123,
  "subscriptionStatus": "<string>"
}