I think I'm going to just try to change the code first and see what happens (I'll of course do a backup first).
If I was to find the code needed to change as you mentioned, where would I go about looking?
I'm going to assume \includes\modules\payment\paypal but than where?
Doing the upgrade to v1.3.8 and saving everything looks like it's more than I think I can handle at the moment...
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