samplesign.js

 /// Authentication setup ///
    qz.security.setCertificatePromise(function(resolve, reject) {
        //Preferred method - from server
        $.ajax("../Scripts/qz/assets/signing/digital-certificate.txt?2018").then(resolve, reject);
    });

qz.security.setSignaturePromise(function(toSign) {
    return function(resolve, reject) {
        //Preferred method - from server
        $.ajax({
            type: "POST",
            url:  getURL("AdminService.asmx/getCertificate"),
            data: "{'message':'" + toSign + "'}",
            contentType: "application/json; charset=utf-8",
            dataType: "text"
        }).then(resolve, reject);

        //Alternate method - unsigned
        //resolve();
    };
});