Does ChatGPT Business include API access?

Does ChatGPT Business include API access?
If I upgrade to Business will I have API access
I’m currently on Plus
What’s the difference?

ChatGPT teams, which you can upgrade to for multiple seats, does not include any API credits. It is also not suitable for deployment to untrusted parties, like employees, as they can invite others to your plan, who can then still invite others.

Enterprise, by name, is a case of “contact sales about your purchase of 100+ seats for your corporation, and negotiate other stuff in your contract”.

Your account already has API access. It is just missing funding it in prepaid credits.