Recurly_Invoice::uri PHP Méthode

    protected function uri()
    {
        $invoiceNumberWithPrefix = $this->invoiceNumberWithPrefix();
        if (!empty($this->_href)) {
            return $this->getHref();
        } else {
            if (!empty($invoiceNumberWithPrefix)) {
                return Recurly_Invoice::uriForInvoice($invoiceNumberWithPrefix);
            } else {
                throw new Recurly_Error("Invoice number not specified");
            }
        }
    }