Hu... thank you very much for your quick answer, but I am far from beeing an advanced user. I can use a joomla interface, but I have no idea of who is CURL, and am very reluctant to make changes in system files such as php.ini that looks like chinese for me
In fact, I though BUYING a componant would avoid me such perillous manipulations.
As far as it is my local system, ok, I can add the line
curl.cainfo = "path_to_cert\cacert.pem" but you will have to tell me exactly where to copy it to keep the file clean.
And furthermore, will it be the same thing with my distant site (where I am not even sure to have the modification rights on php.ini) ?