We are setting up an iptables firewall on our server for our wordpress sites
with ONLY whitelisted IP's allowed through. We want to make sure users
making purchases via paypal will be able to do so: be able to reach paypal,
and see everything paypal sends back. Some purchases use normal paypal
buy buttons, and some, such as membership, access the paypal api (i.e., paypal IPN).
Not sure IF we need to whitelist IPs, and if so, which ones?
Sid
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