When using the webhooks simulator, I get: Got Http response code 500 when accessing https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-6W4482673W002281V-61985753LP2332451
JSon info is being sent back to my site and I can parse it, but when trying to validate (validateAndGetReceivedEvent) - I get the above 500 error.
Also - when I try submitting an actual sandbox sale, the success return url shows me the sale went through, but a hook is never triggered. (I created a hook that has all events checked)
When I trace with error logs along the way (FYI -I use Codeigniter and I don't have the greatest debugging skills), things seems to come to a stop in PapPalRestCall->Execute $connection = new PayPalHttpConnection($httpConfig, $config);