Worked at first

When a customer tries to buy more than one product at a time, they get a Paypal redirection error “Things don’t appear to be working at the moment. Please try again later” The only thing I could find is Paypal has updated its systems on 29th March 2017. Any webform which is used to accept payment via Paypal Standard payment gateway should have “Billing Address” field on it. Make sure you have the field added to the webform and then place it on the checkout page. I don’t see a way to add a billing address form in Ultra Simple Cart. Meanwhile, customers cannot check out with more than one product in their cart.