@type t() :: %PolarExpress.Resources.CustomerMeters{
  balance: float() | nil,
  consumed_units: float() | nil,
  created_at: String.t() | nil,
  credited_units: integer() | nil,
  customer: map() | nil,
  customer_id: String.t() | nil,
  id: String.t() | nil,
  meter: map() | nil,
  meter_id: String.t() | nil,
  modified_at: term() | nil
}