Creloaded One Page Checkout - Needs to pass correct varibles from Protx/Sagepay payment module

Pretty much all as the project title says. We have a one page checkout installed on a creloaded 6.2 site. This works fine with all the usual creloaded payment modules. However it does not pass the correct variables to Protx/Sagepay. This should be a simple job to anyone that knows what they are doing. We have Protx/Sagepay set up in test/debug mode, so it clearly states all the variables and info it's looking for. We're looking for start and completion within the next 3-4 days.