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I'm using EC
I'm a little confused by IPN. Its mentioned in the payment rules config wrt logging, but I've been able to carry out transactions from my dev machine to the sandbox quite happily with data being returned and PP redirecting user to the completed page etc.
PayPal IPN has not had to call in, which I understand is what IPN does, (as it cant on dev due to firewall etc). The PayPal API overview doc (overview-ec.pdf) does not mention it.
Is IPN only used for delayed transactions/pre-authorising etc or for every EC simple transaction, or not involved with EC.
thanks