I'm looking for a SSL Certificate for my WordPress ecommerce site I am developing. I have already confirmed with my host, Dreamhost, that I can purchase any third party certificate. This is my first time doing this, so appreciate any advice.
Couple of specific questions:
1) The cheapest options secure only single domains, as opposed to also subdomains. My site will just have one checkout page that I think needs SSL. Can I go with cheapest option then?
2) Most options claim to be 99%+ compatible with browsers, although some of the more expensive options also mention mobile browsers. Obviously, I would want customers who are using their phones to be able to purchase securely from my website (although I do not have mobile app, just responsive theme design). Do I need to pay extra for this, or is this just a sales gimmick and the cheapest options would still support mobile customers?