@type t() :: %Gleanex.Client.VerificationMetadata{
  candidateVerifiers: [Gleanex.Client.Person.t()] | nil,
  document: Gleanex.Client.Document.t() | nil,
  expirationTs: integer() | nil,
  lastReminder: Gleanex.Client.Reminder.t() | nil,
  lastVerificationTs: integer() | nil,
  lastVerifier: Gleanex.Client.Person.t() | nil,
  reminders: [Gleanex.Client.Reminder.t()] | nil,
  visitorCount: [Gleanex.Client.CountInfo.t()] | nil
}