Hi @Printnode 'unauthorized' error
Try reaching out to PrintNode Support for help with their Zap app integration.
Hey there, @Printnode 'unauthorized' error! 
It’s been a while since you’ve posted here—was PrintNode’s Support team able to help get it sorted or did you manage to figure out a solution on your own?
If so, would you be up for sharing what the solution was? It would greatly help others in the Community that might be running into that same error. 
If not, it might be worth reaching out to our Support team as they’ll be able to dig into the error logs for your Zap to investigate further.
Keen to ensure you’re all set so please keep us updated on how you’re getting on!