Regarding Licenses (Mac OS)

I bought a license a month and a half ago, more or less.
I actually don't remember if i bought it through the app store or directly through the site.
I want to use the software on a second mac i own ( and maybe also a third).
Do I have to buy extra licenses for each one?
I can't find the license on my email.

Thank you in advance

You've purchased directly via the website and I've sent you an email with the registration details.

You can use this code with all of your Macs.

Thank you so much, Florian,
I really appreciate your assistance and prompt response.
Do you develop any more software that might be of interest to me?