Fallback to window.open() if WebApp Hardware Bridge is not running.
If "id" is submitted, it will be echoed back in onUpdate() thus we can trace back to jobs we submitted.
If "qty" is submitted, specified copies of documents will be printed.
The "extras" attribute is an array of object, allows adding annotation text on top of the PDF/Image before printing.
Useful for adding extra text such as timestamp on pre-generated logistic labels.
Example:
{
"text": "Hello World!", // Mandatory
"x": 10, // Mandatory
"y": 10, // Mandatory
"size": 12, // Optional, default 10
"bold": true, // Optional, default false
}