Want to include order_id in VendorTXCode on Protx Form

[nwdavies]

I'm using the Protx payment module and it's working fine. However, I need to be able to link the payment from Protx back to the original order but at present the only link the VendorTXCode gives back is the customer_id. Ideally I would like to add the order_id as well or instead of the customer_id. Unfortunately I don't know php so can't see how to grab the order_id to add it in. Can anyone help?