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// Call API
var response = https.get({
           url: '<https://msgento.com/rest/V1/shipments>',
            headers: { 'Authorization' : 'Bearer wn89yowb2q6jer83mxianf7aap8jul86y' ,
                               'Accept' : 'application/json',
                               'Content-Type' : 'application/json'
                              }
     });

I think he means the url in your call is msgento rather than magento

instead of it I will use Magento site URL