Magento – Magento CE paypal website payments pro hosted solution

Please enable the log for this and check what is showing in the error log while making paypal. May be you will get something from the paypal default magento error log. Please post the output so that i can look more into this.

As far as I know, Magento 2 use Ajax to handle this task.

We should take a look at file:

vendor/magento/module-checkout/view/frontend/web/js/model/place-order.js

      return storage.post(
            serviceUrl, JSON.stringify(payload)
        ).fail(
            function (response) {
                errorProcessor.process(response, messageContainer);
                fullScreenLoader.stopLoader();
            }
        );

So, we need to override this file or the errorProcessor.process() - vendor/magento/module-checkout/view/frontend/web/js/model/error-processor.js handler. We can alert the error message.