I'm using the Paypal Express plugin. All the API information is correct, but when I click the "Checkout with Paypal" button it redirects me to my home page with the url "?wc-api=WC_Gateway_PayPal_Express&pp_action=expresscheckout".
Nothing happens. I've used this plugin before and it directed (and still directs) me to Paypal. I have a multiple-site Paypal Express license. I have no idea what's wrong. I've tried reinstalling the plugin.