WooCommerce REST API with Google UrlFetchApp header authorization not working - wordpress

Question

CURRENTLY
I am utilising WooCommerce REST API in my Google Scripts with the following working code:
var ck = "ck_longstringlongstringlongstringlongstring";
var cs = "cs_longstringlongstringlongstringlongstring";
var website = "https://www.mywebsite.com.au";
var url = website + "/wp-json/wc/v3/orders?consumer_key=" + ck + "&consumer_secret=" + cs;
var options =
{
"method": "GET",
"Content-Type": "application/x-www-form-urlencoded;charset=UTF-8",
"muteHttpExceptions": true,
};
var result = UrlFetchApp.fetch(url, options);
PROBLEM
To improve security, I want to put consumer key and secret into the header, but I cannot get the following script to work
var url = website + "/wp-json/wc/v3/orders;
let authHeader = 'Basic ' + Utilities.base64Encode(ck + ':' + cs);
var options =
{
"method": "GET",
"Content-Type": "application/x-www-form-urlencoded;charset=UTF-8",
"muteHttpExceptions": true,
"headers": {"Authorization": authHeader},
};
var result = UrlFetchApp.fetch(url, options);
Current result = {"code":"woocommerce_rest_cannot_view","message":"Sorry, you cannot list resources.","data":{"status":401}}
Expected result = JSON of orders
Is it an issue with my code? Or with WooCommerce API or Google Scripts?

Answer 1

There are a few issues with your code.
With UrlFetchApp.fetch() you need to use contentType instead of Content-Type.
However, in this case you don't even need to set it since application/x-www-form-urlencoded is the default. Same goes for the method property; it defaults to GET.
Moreover, if you want to err on the side of caution use Utilities.base64EncodeWebSafe(data, charset) to base64 encode your credentials instead of the non-web-safe version.
let url = website + "/wp-json/wc/v3/orders";
let encoded = Utilities.base64EncodeWebSafe(ck + ':' + cs, Utilities.Charset.UTF_8);
let options = {
"muteHttpExceptions":true,
"headers": {
"Authorization": "Basic " + encoded
}
};
let result = UrlFetchApp.fetch(url, options);
result = JSON.parse(result);