Debug PHP payment gateway for Clientexec

We require someone to debug another coders work from the project listed at [login to view URL] The coder completed the work and has dissapeared however we still have issues that urgently need to be resolved. Module is for Clientexec - [login to view URL] and is using the MIGS payment gateway system issues to be debugged are: upon completion of transaction client is forwarded to a blank page instead of back to signup step 6 to complete the transaction No switching was added to the code to put the module into test or live mode, this needs to be added invoices are not being marked off as paid from the return variables sent to [login to view URL] transaction result/error page needs to be themed to tie into Clientexec's raleigh skin. we just need the skin wrappers added This work needs to be done urgently so a quick turnaround is required. if you have any queries please let me know