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Hi Haris, Thanks for your reply, I review the post you mentioned and it works now. Besides, when I move forward, encounter another issue with upload document to package, could you pls help to check? Thanks in advance. code segment: usingLibrary('WseExternal'); var http = new HttpConnection(); var ret = ''; http.url = 'https://sandbox.e-signlive.ca/api/packages/19c4b6e4-3290-4fab-a938-0b88fd8edc7e/documents'; http.followRedirects = true; http.httpMethod = 'POST'; // http body http.postBody = "hello world!!"; // http headers var myheaders = []; myheaders['Authorization'] = 'Basic ===='; myheaders['Content-type'] = ["text/plain"]; myheaders['Content-Disposition'] = ['form-data, name="files[]",filename="test01.txt"']; http.headers = myheaders; http.timeout = 0; try { var response = http.retrieveWithoutException(); var pluto = response.getBodyAsText(); ret = 'Code:' + response.getStatusCode(); ret += "
body: " + pluto; return ret; }catch(e){ return e; } Result: Got response code 500. Pls refer the attachment.