code: func (r Billing_Currency_ExchangeRate) GetAllCurrencyExchangeRates(stringDate *string) (resp []datatypes.Billing_Currency_ExchangeRate, err error) {
  	params := []interface{}{
  		stringDate,
  	}
  	err = r.Session.DoRequest("SoftLayer_Billing_Currency_ExchangeRate", "getAllCurrencyExchangeRates", params, &r.Options, &resp)
  	return
  }
docs: // no documentation yet