Thanks for this article, i was able to generate SSL for all custom domains using this tutorial
gateclose.org (a custom domain that now has SSL in it)
nbstgloballtd.com.ng (the main server)
But i have a little problem, custom domains do not redirect to https by default, and for a custom domain to get data from the main server, it needs to include https, so i do have to enter https manually, pls is there anyway i can go about redirecting all custom domains to https in openresty