Integrating Adobe Express into Our Web Application with Premium Features

Hello,

I am reaching out on behalf of our startup. We are interested in offering Adobe Express to all our clients directly through our platform.

Our goal is to provide a way where our clients can access Adobe Express without needing to log in individually  or without needing the user to manualy create a project and inserting his project access key.

Additionally, we intend to cover the cost of premium features based on the number of users, with our company managing the subscription payments in a global way where we don't have to lake the payments for each user individual.

We have already started the initial integration of Adobe Express SDK into our application and are seeking guidance on the best practices for implementation. Specifically, we would like to understand the following:

1. How can we facilitate access to Adobe Express for our users without requiring them to log in separately or having to manually create a project and insert a Key
2. What are the available options for managing and paying for premium features on behalf of our users? (or having to pay for each user individually)
3. How can we ensure that users cannot view the creations of other users (meaning if we have a common or a global key for all users, They can't view each other's work) ?
   
   We already checked the documentation, and we could not find a clear response.
   
   Thanks.