Wsrtjtyk

I am somehow manage to write a code as per the documentation. But unfortunately it is not working. Below is the code, have a look, please let me know what im doing wrong or missing field. I have written this code by referring someone's code.

function test(){



  var date = new Date(); 

  var amz_date  = date.toISOString(); //2018-05-01T20:40:50.940Z



  var yearMonthDay= Utilities.formatDate(date, 'UTC', 'yyyyMMdd');

  var hourMinuteSec = Utilities.formatDate(date, 'UTC', 'HHmmss');



  var dateForStringToSign = yearMonthDay +'T'+hourMinuteSec+'Z'; //20180501T204050Z



  var datestamp = yearMonthDay; // 20180501



  var access_key = "xxxxxxxxxxxxx";

  var secret_key = "xxxxxxxxxxxxx";



  var method = 'POST';

  var host = 'mws.amazonservices.com';

  var endpoint = 'https://mws.amazonservices.com/Orders/2013-09-01';  

  var canonical_uri = '/Orders/2013-09-01';

  var canonical_querystring =  'AWSAccessKeyId='+encodeURIComponent('xxxxxxxxxxxxx');

      canonical_querystring += '&Action='+encodeURIComponent('GetOrder');

      canonical_querystring += '&AmazonOrderId.Id.1='+encodeURIComponent('xxxxxxxxxxxxx');

      canonical_querystring += '&MWSAuthToken='+encodeURIComponent('xxxxxxxxxxxxx');

      canonical_querystring += '&SellerId='+encodeURIComponent('xxxxxxxxxxxxx');

      canonical_querystring += '&SignatureMethod='+encodeURIComponent('HmacSHA256');

      canonical_querystring += '&SignatureVersion='+encodeURIComponent('2');

      canonical_querystring += '&Timestamp='+encodeURIComponent(amz_date);

      canonical_querystring += '&Version='+encodeURIComponent('2013-09-01');





   //To construct the finished canonical request, combine all the components

   var finished_canonical= method + "n"+host+"n" +canonical_uri+ "n" + canonical_querystring;



   //Calculate the Signature

   var signature=getSignature(finished_canonical,secret_key); 



   //Add signature to querystring

   canonical_querystring += '&Signature='+encodeURIComponent(signature);



   Logger.log(canonical_querystring);

   var request_url = endpoint + '?' + canonical_querystring;

   var options = {



      'method' : 'post',

      'muteHttpExceptions':true,

      'host': host,



   }

   var x = UrlFetchApp.fetch(request_url, options);

   Logger.log(x);

 }

Here is the Signature Generator function in GAS,

//Return Signatue (hash) from HmacSha256 

function getSignature(message,secret){

  var byteSignature = Utilities.computeHmacSha256Signature(message, secret);

  // convert byte array to hex string

  var signature = byteSignature.reduce(function(str,chr){

    chr = (chr < 0 ? chr + 256 : chr).toString(16);

    return str + (chr.length==1?'0':'') + chr;

  },'');

  return signature;

}

As you can see in the code, after generating the Signature, im appending it as a last parameter to the query string. Would that be a issue?

Read the section here called "If you create your own client library". It discusses formatting a url and signing.

Also, here is a link that might help: https://stackoverflow.com/a/36417555/3047