We are working on label printer support but the feature is not available yet. We'll have to wait for the official release for the details. There will be print job support for it in the SDK.
I can tell you it's going to be for specific label printer models though and the Star TSP650 isn't one of them.
EDIT: Clover is adding support for the Epson TM-L90 label printer. That this point support is limited to specific merchants developers can not assume support for it across all Clover merchants. This may change in the future.
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