Use the chrome browser. No idea if others work for this.

https://docs.google.com/spreadsheets/d/1KSlpx2WAQyn0OXfDoK2Z6t9wVK6rqHWWJI-ZzS8JLV4/edit?usp=sharing

Open the sheet and under the File menu select "Make a copy..."

name it whatever you want

Select Tools -> Script Editor

this will open another tab. Go into that tab

look at the code to verify I am not installing anything nasty

Select Edit -> Current Project's triggers

this will open another tab in the G Suite Developer Hub

select "Add trigger" in the bottom right

Choose the function "onOpen" to run in the "Head" deployment in the "from spreadsheet" source and event type "on open"

select Save

it will prompt you to choose an account and allow permissions. choose the current account and approve the access.

go back to your sheet and select the Settings tab.

enter your Tindie username and api key in the indicated spots. You get the api key from the "Seller Tools" tab in your Tindie store

go back to the Data tab and refresh the page

If you don't have any unshipped orders - or it didn't work - it will say "no unshipped orders" in A1

If you do have some they should be listed there in all their glory

Select File -> Download as.. -> Tab-separated values

import this into your shipping software

Note that the address field supports a max of three street address lines at this time. Easy to add more, Endicia supports 7