Is there a way to add a button?

I am looking for a way to add a button the the backoffice orders page:
Either in the shipment or Payment . I want this button to trigger a php script that I have on my server which will make a special label for our delivery system and print on our label printer. The code to make the label is done, I just need the button added for the end user to click on and have it send over a field or 2 to the php code.
Any help would be great
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Answers
Did you figure out a way to do this?
Nope