Hey there @kate423.. Square does not use either multi-domain or wildcard SSL certificates. They create single-domain certificates for Square Online websites. Since this is the case, you would not be able to use Square's certificates to secure another domain. This is a pretty common restriction for website hosts. Those that create multi-domain/wildcard certificates usually charge an extra fee for this added security layer, but as far as I can determine Square does not currently offer this as an option.
So, in order to secure your backup POS, you'd need to create another SSL certificate for that purpose.
Chip A.
Square Expert & Innovator and member of the Square Champions group. (But NOT a Square employee, just a seller like you)
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