Your storefront or client portal URL looks like altroapp.com/yourbusinessname. Every signup through this link is attributed to your account.
You can find it:
In the top-right corner of your partner portal partner.altroapp.com
In the welcome email sent when your portal went live
Make sure clients use the exact full link. If they go to the general Altro site, we won't know they're your client and they won't be able to create an account or order.