Facebook Messenger API “URL COULD NOT BE VALIDATED”

Question

I\'m trying to setup the Facebook messenger API and I\'m getting this error when I attempt to add the WebHook:

The URL couldn\'t be validated. Callback ve

Answer 1

You can use the chained certificate by the following shell:

cat www.example.com.crt bundle.crt > www.example.com.chained.crt

From http://nginx.org/en/docs/http/configuring_https_servers.html#chains