FluentCRM Single-Site License Question

Can I use a single site license on a domain and its subdomains like this: theartofapplying.com, app.theartofapplying.com, flow.theartofapplying.com?

For example, a user opts into my mailing list on my marketing website (Site A) but then becomes a paying member of Fluent Community on my Shop website (Site B).

Can I pay for one FluentCRM single-site license to have FCRM on my site and its subdomains?