Hello, The thread above was from a year ago, so the original thread is no longer pinned. There are two endpoints you can use for IPN validation. https://ipnpb.sandbox.paypal.com/cgi-bin/webscr & https://www.sandbox.paypal.com/cgi-bin/webscr If one is not working for you, please try the other. The steps to follow for IPN validation can be found in this support article : https://developer.paypal.com/api/nvp-soap/ipn/IPNImplementation/#link-ipnlistenerrequestresponseflow Thanks !
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