PayFlow - OrderID is not getting the invoice prefix.

[angelleye]

In our settings we have the ability to add an Invoice Prefix which gets appended to the front of the order ID in API calls.

With PayFlow, this is happening for the INVNUM parameter, but there is also an ORDERID parameter where this is not happening and is resulting in duplicate order failures for some users.

We need to make sure the ORDERID parameter gets the invoice prefix set by the plugin settings the same way INVNUM is.