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.