OK, following a post on this
thread:https://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Authorize-Net-Begins-Infrastructure-and-SHA-2-Certificate/bc-p/50166#M445
I replaced cert.pem with the file from http://curl.haxx.se/ca/...
Well I was hoping this would be fixed this morning. Like everyone, I was
cruising along fine until the suddenly stopped working yesterday. Small
mod to the api got it working for now. HttpClient.php , line 80, comment
out:curl_setopt($curl_request, C...
