Is developer account must for creating test portal?



We have paid Hubspot account which is in use for our live production app and we have done some API integrations with Hubspot now. Do we suppose to create another developer account in Hubspot for creating test portals which we can use for testing API integration in our BETA and development environment or is there any way to create those test portals in our production Hubspot account itself?

Any help will be highly appreciated.

Thank you.