security - Using HTTPS in the paypal IPN listener -

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we integrating our online payment system paypal ipn transaction notification backend , got stucked problem while testing sandbox:

when using listener script url http works flawlessly, when specifying secure url stops working. on ipn history page (https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_display-ipns-history) calls made using secure listener show no http response our server(!). direct access both url work browser.

our guess either ipn calls don't work against secure listeners (we couldn't find word in documentation) or paypal sandbox ipn servers don't our ipn listener certificate (which free startssl valid certificate).

did find similar or provide advise?

i've done https, work. have put 'https' in ipn url of course that's registered @ paypal. check ssl certificate signed recognised ca.


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