Multi-region currency and order management

[Mark-G-Travers]

Hi Folks,

I have two questions related to multi-region commerce. 

1. 
I understand that Shopify supports multiple domains to be setup and assigned each domain to a currency. 

Can Subdirectories be used instead. such as www.mystore.com/us Vs www.mystore.com/au  etc. 

2.

The second part to this is a follow up to see if it is now possible to restrict crossed currency/ shipping locations

Meaning someone in the USA can't checkout in AUD and vice versa. 

Thanks in Advance,

Mark 

[jaaved]

I found this from a few years back: https://www.shopify.com/blog/shopify-store-multiple-countries

Seems subdomain is the only option (yet to find something to state otherwise). Would love for subfolders to be an option (tends to be better for SEO).