Hello our company are using express checkout and it is working well. we got a email about " Changes required to your PayPal integration to continue accepting payments." from paypal. Before we got the email from paypal, we had developed with sample source (
https://devtools-paypal.com/guide/expresscheckout?interactive=ON&env=sandbox ). the source doesn't use SSL. But paypal said on email that deadline is 17 June 2016. what do we have to change ? as i mentioned, our sources and paypal sample sources don't use SSL.
