Opening the Order Tracker inside Shopify (embedded app)

For admins

Add the tracker to your Shopify admin sidebar, and what to do when it says "refused to connect".

In the Shopify Dev Dashboard you can tick Embed app in Shopify admin for an app. Shopify then shows the app's App URL inside its admin. The tracker supports this with a small page that opens the real tracker in its own tab, because signing in, printing labels and the scanner need a normal browser tab.

Set the App URL to your address, for example https://track.example.com (or https://track.example.com/shopify_embed.php).
Tick Embed app in Shopify admin, release the version, and open the app from your Shopify admin sidebar.
Press Open Order Tracker. It opens in a new tab.

NoteIf Shopify says your address refused to connect, the site was not allowed to appear inside Shopify. Use the current version of the tracker, which allows this one page to be framed by admin.shopify.com and your own myshopify.com address only. Every other page still refuses to be framed.