I'm using paypal-express https://github.com/nov/paypal-express
gem for PayPal Express payments.
I send only information about item - title, price, quantity, currency to paypal to checkout in paypal site. Later I get response to my site about successful or not payment. Should I need SSL(https) to establish that?
Now it works on sandbox, but it fails for real payments:
PayPal API Error: 'Security error'