UrlFetchApp Authentication failed Freshbooks - urlfetch

Question

So I am trying to communicate with the freshbooks api by making the sample request detailed on the developers page of freshbooks (http://developers.freshbooks.com/). We are doing token-based authentication as opposed to using OAuth.
I have my code logging the responses to my requests in a spreadsheet. The responses it has been logging are as follows:
<?xml version="1.0" encoding="utf-8"?>
<response xmlns="http://www.freshbooks.com/api/" status="fail">
<error>Authentication failed.</error>
<code>20010</code>
</response>
I have been able to authenticate when using a curl command in console, but not when running the script. Below is the code I used. Left out the logging to spreadsheet part and our specific url and authToken:
// Sample function to call into an API using basic HTTP auth
function freshbooksTest () {
var url = ;
var authToken = ;
var unamepass =authToken+":X";
var digestfull = "Basic "+unamepass;
var payload = '<request method="system.current"></request>';
var options =
{
"method" : "post",
"muteHttpExceptions": true,
"headers" : {"Authorization": digestfull},
"payload" : payload
};
var response = UrlFetchApp.fetch(url, options);
var xml = response.getContentText();
}
I have checked out threads where people are having similar problems, but the solutions were either not applicable to my situation, or have already been tried. Any suggestions are welcome.

Answer 1

Not specifically familiar with UrlFetchApp, but if it doesn't do it for you, you'll need to Base64 encode digestfull before you send it in the header.

Answer 2

Looks like you need to base 64 encode your auth token. Code should look like this:
function freshbooksTest () {
var url = ;
var authToken = ;
var unamepass = authToken+":X";
var digestfull = "Basic "+ Utilities.base64Encode(unamepass);
var payload = '<request method="system.current"></request>';
var options =
{
"method" : "post",
"muteHttpExceptions": true,
"headers" : {"Authorization": digestfull},
"payload" : payload
};
var response = UrlFetchApp.fetch(url, options);
var xml = response.getContentText();
}