just be careful if your affiliate side is skinned - that will require completely redoing.
Apart from that, any custom smarty functions will be preserved, TMM will take care of the nats3->4 move for nats core and I think billers postback urls change for some billers, but nothing amazingly out of the ordinary for you.
Some things are a lot lot smoother in nats4, others are less so. However, whenever development halts on one version, it's time to move over to the new version or get left behind.
Migrating from 3 to 4 will only get more difficult the longer you leave it....
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For coding work - hit me up on andy // borkedcoder // com
(consider figuring out the email as test #1)
All models are wrong, but some are useful. George E.P. Box. p202
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