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Not a sandbox issue but I couldn't figure out where else to post this.
I've had my IPN listener in place for over 6 years, nothing has changed but everything has stopped working.
I've added some diagnostics & the issue is happening where I'm doing step 2 in the IPN flow and sending the empty 200 response to https://paypal.com/cgi-bin/webscr but it returns a 404 & consequently the flow isn't completed & the purchases aren't completing (though paypal is taking the money)
Please can somebody help with this - I'm getting desperate here