PayPal Community

simplybook_dimk · ‎Jul-10-2019

Hello! Sometimes we are getting 400 error from paypal when validating notification. But if i make the same request after some time it works correctly. Please check the response from paypal:

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
</p>
</body></html>

I can not provide request, because it contains private information.

It happens only in 1-3% of requests.

wilder_cuba · ‎Jul-21-2021

@moshe007 in my case, I used PHP and my verify IPN method is based on https://developer.paypal.com/docs/api-basics/notifications/ipn/ht-ipn/ and using Sandbox, sometimes got a 200 response and sometimes 400 (like you).

The god news is that when I put my script in production, everything WORKS FINE!!!

Then it's obvious, Sandbox enviroment have problems with IPN.

Best regards

moshe007 · ‎Jul-21-2021

Thanks @wilder_cuba 🙂

I am just obviously concerned to put this into production....

yibizzi · ‎Aug-16-2021

I'm getting the same error. I'm using firebase functions to listen for IPN notifications, but I get "Bad Request Your browser sent a request that this server could not understand." as when verifying messages with paypal.

PayPal Community

400 error on validate IPN

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