Node-Red SSL Issue

I have followed http://www.steves-internet-guide.com/securing-node-red-ssl/ .

But when i am sending webhooks from shopify to node-red http end point . It is not sending any request then i have trued beeceptor and redirect request to my node-red end point there it is throwing below error-
SSL or certificate issue while connecting.

I have purchased SSL also for a domain and redirected that to my node-red IP but still the same issue is there.

Can anyone help me out to fully secure node-red ?

have you asked Steve about your issue?

not yet, i will ask him also.