Installed a TLS/SSL certificate for this site from LetsEncrypt.org using acme.sh and DNS API for proving the domain ownership.
I have written a blog post about Installing a LetsEncrypt.org wildcard certificate on Linux using acme.sh and a DNS Api. I recently updated the instructions on how to use acme.sh if you need to install API keys for many different registrants.
Installing a LetsEncrypt.org wildcard certificate on Linux using acme.sh and a DNS Api