Do we need a sales license?

Using the Zoom API, we developed a system that links zoom to our own system.
Do we need any permission to sell this for a fee?
I have inquired by email, but I have not received a reply, so I am asking a question in the forum.

Hi @tajima-a, you may not sell licenses to Zoom services without an approved ISV reseller agreement. In other words, you may not provide Zoom licenses to your users. You can however charge for the ability to connect a user’s Zoom account to your own software.

For example, Calendly charges for the premium service to connect and use the Zoom integration.