Merchant Security Updates: Learn how security upgrades may affect your integration at the 2016-2017 Merchant Security Roadmap Microsite
Payments Standard Updates: Beginning March 29th 2017, PayPal will offer a few enhancements that may require integration changes. Read more here:
Payments Standard Upgrade FAQ
Recently I faced in sandbox IPN simulator like, in return URL i didnt get tracsaction ID. But I get notification URL successfully.
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