Looking to integrate our Heygen into our CRM to generate video advert for our properties

We are an estate agency and we are looking to integrate our Heygen into our CRM to generate video advert for our properties.

Please can you assist us with the below questions:

What's the recommended approach to be redirected to Heygen to create Avatar Videos from our platform when our users trigger the "AI Video Generator" button on our CRM platform?

We want our users to be redirect to Heygen as soon as the "AI Generate Video" toggle above is triggered?

We will be onboarding 70 - 90 users in the 1st month of Go live, please can you confirm whether each user journey would be unique to each user? How can this be implemented with your APIs?

Are there any restrictions/limits on the APIs calls?