As mentioned earlier, find the random capitalised letter, remove it.
Enjoy.

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use
setInterval(()=> {
$.ajax({
url: "http://www.lazada.com.my/ajax/lottery/spinTheWheel/?lang=en&platform=desktop&wheelToken=b5dd7e9dcbde84b3e11a9ae90d377b02&dpr=2"
})
.done(function( res ) {
  if ( res && res.data && res.data.voucherCode ) {
alert(res.data.voucherCode);
    console.log( "Voucher:", res.data.voucherCode );
  } else {
console.log('wait')
  }
});
}, 1000)

in 3 tab

then

var getJSON = function(url) {
return new Promise(function(resolve, reject) {
  var xhr = new XMLHttpRequest();
  xhr.open('get', url, true);
  xhr.responseType = 'json';
  xhr.onload = function() {
    var status = xhr.status;
    if (status == 200) {
      resolve(xhr.response);
    } else {
      reject(status);
    }
  };
  xhr.send();
});
};

setInterval(function() {
getJSON('http://www.lazada.com.my/ajax/lottery/spinTheWheel/?lang=en&platform=desktop&wheelToken=b5dd7e9dcbde84b3e11a9ae90d377b02&dpr=2').then(function(data) {
  if(data.data.voucherCode) {
  console.log('Voucher: ' + data.data.voucherCode);
  }
  else { console.log('no voucher'); }
  }, function(status) { //error detection....
alert('Something went wrong.');
}); }, 5000);

in 3 tab

so i open 6 incognito tab

I use script from here, probably from you, and add it into tempermonkey

Here my latest method

1. Install tempermonkey
2. Click on tempermonkey, create new script, then paste this script(copied from this tered), then saved it

3. Install SessionBox plugin
4. Open http://www.lazada.com.my/helpcenter/
5. Press Ctrl+Shift+A to open new temporary session tab
6. Press Ctrl+Shit+J to open console
7. Repeat step 5 and 6 until you have how many session tab you want
8. You will get notified, copy the code and close that tab that already get voucher
9. Repeat step 5&6 to create new tab to replace the tab you had closed

*in my computer somehow need to open console for the code to loop more than 1000times. If I dont open console the script stuck at 1000th time. So I add step 6 to solve this.

doesnt seem to get any

There's still more for tomorrow. So as usual, don't feel bad etc, just try again.
Unless Lazada disables all the vouchers then... GGWP.
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Will post another small batch later.

Also will save a few batches for tonight so people can buy their stuff after work.

Not yet.