Cremation Urns review for AfterShip Shipping + Labels

I couldn't get past setting up a courier. Ended up in an endless login loop. Support was poor (sent me a Developers Guide, asked me the stock standard "change browser"--I'm using Chrome, if it doesn't work with Chrome, it's no good). Eventually was able to click on courier icon. Took me to an API set up screen with message for Shopify users to click on a link to the new experience. Back in the loop. Uninstalling.