Hi, I'm switching from Authorize.net API to PayPalfor payment processing. The payment paradigm will go from Anet's synchronous system to an async post back from PayPal after a transaction is completed or canceled. As our development system is behind a firewall and doesn't have a public IP I was wondering if there are any tips on how to accept this post back result from PayPal at the local dev server without having to open a hole in our firewall for the post back HTTP traffic?
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