If you’ve looked at the activation method for IPN, you’ll know that it’s by entering a default IPN URL into your PayPal profile. PayPal’s logic must be that if you want to use IPN, then you must have at least one site with a script that uses it.
I think this then is why the confusion arises, and I too was confused a few years ago when I first used an IPN script and wanted to accept PayPal payments on several sites. I thought that if there was only one IPN URL, then I could only use PayPal with one site.
Seemed logical to me, and I think to most other people too judging by the questions asked.
The truth is, as I mentioned above, it’s just a default URL and not the only one you can use.
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