Showing results for 
Search instead for 
Did you mean: 

Payment Data Transfer Validation Error 4002

New Community Member

Payment Data Transfer Validation Error 4002

I am experiencing an issue with retrieving order information from payment after receiving the PDT post on my success page. The same code works in a sandbox environment, but not in a live environment. 


1. I receive a post to my success page from PayPal

2. I create a POST request to 

3. I specify cmd=_notify-sync&tx=...&at=... data as part of the POST request body (works perfectly in a sandbox environment)

4. I make the request and get back a FAILED response with error code 4002.


I validated the authentication token in my PayPal account, but can't figure out why I am getting 4002 back. When I tried making the same request using Postman, I saw an error the following error:


You have requested an outdated version of PayPal. This error often results from the use of bookmarks.


Can someone help me figure this out? Thanks in advance.