Print PDF to a Label Printer connected via USB?

I receive PDF as Base64 from an third party API. How can I print it to a USB Label Printer which is connected to the clients device?
Is there any solution to this? The label printer also supports ZPL format. I dont want print-prompts to pop up. The user will scan prepackaged boxes one by one and will receive label by label so there is no time to use a mouse and press “print”.

hi @Ben

Take a look at the following post

Regards, Vlad