Here's another little gotcha that isn't directly addressed - handling an Additional Store that has the exact same Product Codes as the main store. I have discovered (the hard way) that both stores cannot have the same Canonical URI's. This is where a little pre-planning will come in handy when creating the Canonical URI's. It will address an SEO issue or two along the way. You could add your Additional Store name or a code into the Canonical URI and still keep the same Product Code, but if you are expecting (or needing) Canonical URI's something like this:
It ain't gonna happen. But you could do something like:
https://domain-one/D1-abc123.html or https://domain-one/store-one/abc123.html
https://domain-two/D2-abc123.html or https://domain-two/store-two/abc123.html
This all is a little different from the Multi-Domain URI's - domain-two's URI's will still need to be a Multi-Domain URI and not the URI. Yeah, it's a little confusing, but it's something to be aware of IF you plan on having the same product codes and generating URIs similar to the "pattern" this store uses.
It ain't gonna happen. But you could do something like:
https://domain-one/D1-abc123.html or https://domain-one/store-one/abc123.html
https://domain-two/D2-abc123.html or https://domain-two/store-two/abc123.html
This all is a little different from the Multi-Domain URI's - domain-two's URI's will still need to be a Multi-Domain URI and not the URI. Yeah, it's a little confusing, but it's something to be aware of IF you plan on having the same product codes and generating URIs similar to the "pattern" this store uses.