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I've been using IPN verification successfully for years now. It suddenly stopped working. I send the verification request to https://ipnpb.sandbox.paypal.com/cgi-bin/webscr?cmd=_notify-validate

It seems like there is something wrong with their certificate not matching 'ipnpb.sandbox.paypal.com' This is the url listed in their documentation.

I also tried using www.sandbox.paypal.com as suggested here but still did not work.

Could anyone tell me what's going on?

chibeepatag
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  • What is the precise error? Both URLs, https://ipnpb.sandbox.paypal.com and https://www.sandbox.paypal.com , with or without `/cgi-bin/webscr?cmd=_notify-validate` should load fine in a browser. Assuming they do, the problem is your environment not able to do what your browser can. – Preston PHX Mar 02 '22 at 11:52
  • I ran into the same error with an old script, which uses www.paypal.com domain. It looks like some kind of internal server error in PayPal. – HZhang Oct 12 '22 at 06:55

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