I need to obtain a certificate installed on the client PC with the browser (javascript) and send it to the server to sign a pdf document generated with a library such as TCPDF (php). Someone who knows about this so you can guide me please. The certificate they want to buy in a Chilean company called link or www.e-sign.cl. It is a certificate of Advanced Electronic Signature (FEA). I have never done this so if you can help me avoid more complications with this I would appreciate it.