public function getGatewayInvoiceParams($params = array(  )) {
			global $whmcs;
			global $_LANG;

			if (count( $params ) < 1) {
				$params = $this->initialiseGatewayAndParams(  );
			}

			$invoiceid = $this->getID(  );
			$userid = $this->getData( 'userid' );
			$invoicenum = $this->getData( 'invoicenum' );
			$balance = $this->getData( 'balance' );
			$result = select_query( 'tblclients', 'tblclients.currency,tblcurrencies.code', array( 'tblclients.id' => $userid ), '', '', '', 'tblcurrencies ON tblcurrencies.id=tblclients.currency' );
			$data = mysql_fetch_array( $result );
			$invoice_currency_id = $data['currency'];
			$invoice_currency_code = $data['code'];
			$params['invoiceid'] = $invoiceid;
			$params['invoicenum'] = $invoicenum;
			$params['amount'] = $balance;
			$params['description'] = $params['companyname'] . ' - ' . $_LANG['invoicenumber'] . ($invoicenum ? $invoicenum : $invoiceid);
			$params['returnurl'] = $params['systemurl'] . '/viewinvoice.php?id=' . $invoiceid;
			$client = new WHMCS_Client( $userid );
			$clientsdetails = $client->getDetails( 'billing' );
			$clientsdetails['state'] = $clientsdetails['statecode'];
			$params['clientdetails'] = $clientsdetails;

			if ($params['convertto']) {
				$result = select_query( 'tblcurrencies', 'code', array( 'id' => (int)$params['convertto'] ) );
				$data = mysql_fetch_array( $result );
				$converto_currency_code = $data['code'];
				$converto_amount = convertCurrency( $balance, $invoice_currency_id, $params['convertto'] );
				$params['amount'] = format_as_currency( $converto_amount );
				$params['currency'] = $converto_currency_code;
				$params['basecurrencyamount'] = format_as_currency( $balance );
				$params['basecurrency'] = $invoice_currency_code;
			}


			if (!$params['currency']) {
				$params['amount'] = format_as_currency( $balance );
				$params['currency'] = $invoice_currency_code;
			}

			return $params;
		}