Forge - Adding friends Digi Ocean account to my Forge account...

My friend wants to create an ecommerce site which I have said I can do but I want him to set up and control his domain and hosting.

I currently have my own digital ocean and forge set up which I host multiple projects on.

But before I go ahead and get my friend to sign up with DO, I just want to make sure that I will be able to then connect his DO account to my Forge account.

I have the "Growth" plan on forge. I can see in the User Profile->Server providers that my current DO account is in the list of providers, and there's options to add a new provider there with some credential using an API token.

So it seems likely that I am able to use my friends account as well as my own in that way. I just wanted to ask on here first because I am not sure what the diffference is between sharing DO accounts this way and "Circles" section which requires the business plan. Maybe circles is sharing Forge account access rather than DO accounts?

Thanks in advance anyway.