What are costs to use Zoom APIs for creating meetings?

We have platform where businesses can create meetings with participants, the problem we currently have is that our booking platform allows variable length of booking duration in minutes or hours. But zoom only allows 40 minutes.

Do we need to purchase any package to increase the limits?

Hi,
If you want to bump up your Zoom meeting times beyond the 40-minute limit, you’ll need to upgrade from their basic plan
Cheers,
Harsh

Correct, please see this post on Zoom’s plans and webpage: