Ask HN: How Handle Enterprise Billing?

I'll be launching a service soon and it has some pretty basic billing plans. Free and 3 others. However, I do need a billing plan for enterprise clients who will board their own clients.

Each plan has its features and restrictions.

I was thinking of having enterprise choose which billing plan they want per account they register at a lower price. That way the user is restricted to those features and limits.

For example each team would get the advanced features at $2/m instead of $5. OR Give it to the enterprise for free and they pass the cost onto their clients at a reduced rate.

They would probably pass those costs onto their clients.

Unless there is a better way of doing it, I'm looking for suggestions.

thanks