Attempts to validate ipn payloads against the url https://ipnpb.sandbox.paypal.com/cgi-bin/webscr are returning a 404 http code with the message "ROUTE_NOT_FOUND" Is the validator service down for sandbox? ex: curl --location --request POST 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr' -d 'cmd=_notify-validate&mp_custom=test'
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