Thank you for looking at this for us. Paypal are upgrading their SSL. I have PayPal payment links in my apps. I am not certain how this affects us. Is it the app that needs something doing to it or the website that has the payment button on it? I'm sure there are many Seattleclouds users who have PayPal buttons insider their apps and also people who have PayPal buttons that open on their own website.
There are some details at https://www.paypal-knowledge.com/infocenter/index?page=content&widgetview=true&id=FAQ1766&viewlocale=en_US
I spoke with PayPal and they will implement this change is from the end of this month.
Please let us know how this will affect PayPal in our apps.