Hi,
In my ospoint account, I can generate one API for one site url while I run 3 osclass sites. I request to add multiple sites and multiple API requests in same oscpoint account on your website instead for each site to have separate access and separate merket connectivity.

Please create one account for each website, best way is to have [email protected], [email protected] etc.
If you use just one major mail for all your emails, simple setup redirect for all mails.