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Updated README

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@@ -29,6 +29,15 @@ Example code:
}
});
+Note that all the package does is confirm that the IPN message is valid. After this, you will still need to make some more checks:
+
+> Confirm that the payment status is Completed.
+> Use the transaction ID to verify that the transaction has not already been processed, which prevents duplicate transactions from being processed.
+> Validate that the receivers email address is registered to you.
+> Verify that the price, item description, and so on, match the transaction on your website.
+
+You can find more information on the [Paypal documentation for IPN](https://cms.paypal.com/cgi-bin/marketingweb?cmd=_render-content&content_ID=developer/e_howto_admin_IPNIntro).
+
### The callback
The callback has two parameters, `err` and `msg`.

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