Using Postman to create multiple Websites via API & CSV?

Well, just bumping this because it came up again yesterday.  I was able to create a device group with no issues, but simply by change it from device/groups to website/groups made it all break.  It ended up being the version.  When I tried to add it to the URL it didn’t help.  What seemed to work was to specify it in the header like this:

Once I did that, everything seemed to start working.  Just in case it comes up for me again, I’m documenting it here.  Or if it helps anyone else, there you go.  :)