If your domain service is using: OVH/Kimsufi/soyoustart/runabove, acme.sh can issue cert automatically through their domain api now.
The usage is very simple:
# application key
export OVH_AK="your application key"
# application secret
export OVH_AS="your application secret"
acme.sh --issue -d mydomain.com --dns dns_ovh
For more usage, see: https://github.com/Neilpang/acme.sh/wiki/How-to-use-OVH-domain-api