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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">
<title>400 Bad Request</title>
<p>Your browser sent a request that this server could not understand.<br />
I can not provide request, because it contains private information.
It happens only in 1-3% of requests.
We solved this issue by implementing up to 3 attempts IPN verification if it fails. Usually verification successfully completes after second attempt.
We're seeing this issue too - for an online retailer that takes approx 1000 orders per month outside sale seasons. We've seen this error 4 times starting on 2nd July 2019. Zero occurrences before July and this integration has been live since 2015 and only previously interrupted by the occasional SSL change.
400 Bad Request
Your browser sent a request that this server could not understand
It does not appear to be specific to the content in our request to the IPN URL either - I am confident of this because I have an automated test configured that hits the IPN endpoint once per hour with an empty request and alerts me if we get back anything other than the expected "INVALID" response. This is intended to warn us to investigate SSL and network conditions on our side and to go check Paypal connectivity from another box, however it has also managed to report the 400 Bad Request error a few times this month, always resolving itself on the next test attempt, despite no changes on our side.
Hi, can you please give a link of this notification or report the exact text? I can't see nothing on the paypal-status websites, neither by e-mail or as an answer to a technical support ticket.
Here is text:
thanks for your patience and waiting.
The issue had been resolved hours before and please kindly confirm.
But those already impacted IPNs , you need to access your IPN history to resend them.
Again we apologize for the inconvenience this has happened, we'll continue improve our environment and product better.
Thank you for your understanding.
Have a great day!
Merchant Technical Support