shipping-portal/config/qr.php

<?php

return [
    // please update resources/assets/vue/app.js if value is changed
    
    // 'qr_code_img_url' => 'https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=', // not working 
    'qr_code_img_url' => 'https://qrcode.tec-it.com/API/QRCode?data=',
];