To update the source code for QR Codes, you must update the URL. This change, however, requires resorts that use QR codes to replace the message template source code in their email template HTML as follows:
Go to Content management > Message templates in Admin.
Scroll to locate the OrderPlaced.CustomerNotification template (or other template to which you would like to add a barcode) and click Edit
Click Tools > Source Code
If editing, search the Body for
https://chart.googleapis.com/chart?chs=200x200&cht=qr&chl=XX%Order.OrderNumber%
(where XX is your resort prefix) and replace it with this new URL:
https://quickchart.io/qr?key=q-ehh6nug75aq43p7fx81qefdtjf5o0foq&size=300&text=XX%Order.OrderNumber%
(where XX is the resort prefix)Click OK.
Click Save at the top of the Edit message template details page.