EBS Payment Gateway Integration Error..!!

Hi,

We have bought EBS Payment Gateway and installed the integration kit also.
In Extenstions-> Payment -> EBS, we have entered the correct Account ID and Secret Key.
But while making the transaction, it just shows ERROR : INVALID ACCOUNT ID
Checked with EBS also, they said the Account ID is fine, there must be some problem with the integration only.

Please help in this matter. That would be very helpful..

Thanks.
www.colorsplash.in

The EBS customer service guys says we need to use POST method for sending Account ID.
Can anyone please let me know in which file is the POST and GET method set for Account ID??
Please help.. I am stuck for 2 days...!!