My website has been working well for many years, using Payment Standard html form based API in Live mode and Sandbox mode, ie. <form name="some_name" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="notify_url" value="http://www.some_url.php"/> For sandbox mode I change the action to "https://www.sandbox.paypal.com/cgi-bin/webscr" However, I just went to test a payment in sandbox mode today, and my notify_url did not get called. It does get called in Live mode. Has something changed on PayPal in the last few months? Any ideas what I could check?
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