code: func (r Billing_Currency_ExchangeRate) GetExchangeRate(to *string, from *string, effectiveDate *datatypes.Time) (resp datatypes.Billing_Currency_ExchangeRate, err error) {
  	params := []interface{}{
  		to,
  		from,
  		effectiveDate,
  	}
  	err = r.Session.DoRequest("SoftLayer_Billing_Currency_ExchangeRate", "getExchangeRate", params, &r.Options, &resp)
  	return
  }
docs: // no documentation yet