It depends on what the NATS program uses for webmaster referral. Those that use ?ref=XYZ will not be cookie tracked. Those that use a normal /track/ url will work just like all other systems and store a cookie for by default 10 days.
The ref variable in the form does not HAVE to be filled for you to get credit in case they use /track/.
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"Think about it a little more and you'll agree with me, because you're smart and I'm right."
- Charlie Munger
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