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Payment Data Transfer Validation Error 4002

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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 http://www.paypal.com/cgi-bin/webscr/ 

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You have requested an outdated version of PayPal.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.

 

Max