I was testing the paypal API for a website I’m making. Everything was working fine last night, but when I ran it again today, I received the following error:
Could not establish secure channel for SSL/TLS with authority ‘api-aa.sandbox.paypal.com’
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Had the same. Try to use http://api-3t.sandbox.paypal.com/ instead.
It helped me. I found it here: setExpressCheckout and SSL/TLS error