Magento Argofire payment gateway integration

We have Magento CE 1.3.2.4 based website. We are trying to integrate with argofire payment gateway. However, we are seeing an exemption error because Invoice Number is not being loaded into argofire payment gateway string. Need coder who can investigate and resolve this issue.

See attached system deb info:

Array

(

[curl_request] => Array

(

[username] => XXXXXXXX

[password] => XXXXXX

[TransType] => Sale

[amount] => 45.00

[Street] => 1 Railway Siding

[Zip] => 8XXXXXXX

[CardNum] => XXXXXXXXXXX

[ExpDate] => 0514

[CVNum] => 123

[NameOnCard] => XXXXXXXXXXX

[MagData] =>

[InvNum] =>

[PNRef] =>

[CheckNum] =>

[TransitNum] =>

[AccountNum] =>

[MICR] =>

[NameOnCheck] =>

[DL] =>

[SS] =>

[DOB] =>

[StateCode] =>

[CheckType] =>

[Pin] =>

[RegisterNum] =>

[SureChargeAmt] =>

[CashBackAmt] =>

[ExtData] => <CustomerID>Magento1</CustomerID>

)

)

2011-06-30T16:59:58+00:00 DEBUG (7): DEBUG: #040399 ARGOFIRE_BASIC_SALE: End _buildCurlRequest_Pcc()

2011-06-30T16:59:58+00:00 DEBUG (7): DEBUG: #020201 ARGOFIRE_BASIC_SALE: Begin _postCurlRequest

2011-06-30T16:59:59+00:00 DEBUG (7): NOTICE: #020205 ARGOFIRE_BASIC_SALE: CURL_RESPONSE:

<?xml version="1.0" encoding="utf-8"?>

<Response xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://TPISoft.com/SmartPayments/">

<Result>7</Result>

<RespMSG>Field Format Error</RespMSG>

<Message>Missing required invoice number.</Message>

<ExtData>CardType=VISA</ExtData>

Magento PHP XML

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