Integrate Commonwealth bank (commweb) module on the merchant side

We are running a customised version of OsCommerce 2.2 RC1 and currently have a merchant account with the Commonwealth bank of Australia. The commonwealth bank supply a server side application that makes use of the Mastercard MIGS system that can be integrated into oscommerce using PHP. CommWEB needs to be integrated into oscommerce to run merchant hosted transactions, rather then take the client to the MIGS website, as to keep the transaction seamless and remain within our website. Commweb is supplied with a complete SDK that can assist in this project. The server is running Centos 4.2