I had an error on PayPal checkout:
“Failed to connect via curl to PayPal. The most likely cause is that your PHP installation failed to verify that the CA cert is OK”
…went to the checkout page in wordpress and changed the default shortcode from:
[checkout_paypal_express]
to:
[checkout_paypal]
and it worked. We were panicking after having inputting 100+ products and placed shortcodes everywhere.
Hope this helps someone!