Magento Patch 8167
You may discover an important message about Patch 8167 (SUPEE-8167) in your Magento adminhtml. This patch needs to be installed till june 30, because Paypal IPN will be changed. If you use Paypal standard, you won’t get payments after this date. So hurry and install this patch!
Magento Patch 8167
This new Patch 8167 relates to a upcoming change in Paypal IPN. It has no known drawbacks, so you can install it even on your live system. The only important thing to know is, that this patch has a deadline. On June, 30 PayPal switches its notification system. From this time on, no standard PayPal orders will get updates and you may have to control payments manually.
Conclusion
Install Patch 8167 until the end of this month and everything is fine. If you discover problems and read this after June, 30 install this patch!