/** * Issues against the Bf_Subscription, credit of the specified value and currency. * @param int Nominal value of credit note * @param ISO_4217_Currency_Code The currency code * @return Bf_CreditNote */ public function issueCredit($value, $currency = 'USD') { $creditNote = new Bf_CreditNote(array('nominalValue' => $value, 'currency' => $currency)); return $creditNote->issueToSubscription($this->id); }