Cart - Use permalinks to pre-load the cart

Awesome, this information is really useful.

There is only one thing missing that I haven’t been able to figure out:

Besides notes, referrals etc. is there any way to add a tag to the permalink as well?

Like Please contact Shopify support at support.shopify.com – Opening Soon**

That would really help me a lot. Any idea how to do that?

I need a tag (or s.th. similar) which I can use as a parameter to filter for in the full order list. See also my thread about this question here: https://community.shopify.com/post/1154028