code: function LobErrorStatus(response) {
    MessagingServiceStatus.call(this, 'lob');
  
    this.state.message = response.message;
  
    // See https://lob.com/docs/node#errors for details
    if (response.status_code == 401) this.state.code = this.StatusCodes.UNAUTHORIZED;
    else if (response.status_code == 404) this.state.code = this.StatusCodes.DATA_REJECTED;
    else if (response.status_code == 422) this.state.code = this.StatusCodes.DATA_REJECTED;
    else if (response.status_code == 500) this.state.code = this.StatusCodes.SERVICE_DOWN;
    else this.state.code = this.StatusCodes.DEFAULT;
  }
docs: /*
  Error Status
  
  @param response     JSON response object from Lob service