Has anyone discovered a plug-in or app to create a printable shipping label for UPS or FedEx from within a knack application? I am trying to build an RMA application for customer returns and it would be awesome to include a printable UPS or FedEx label to email the customer.
This sounds like a good use-case for Integromat (a.k.a. Make) or Zapier.
Using one of those tools, you could create a workflow that uses ShipStation to create the shipping label, then trigger the workflow inside the Knack app on click of a button, submission of a form, etc.