SaaS, Create Stripe Webhook to create Database Structure and Dynamic Security

So I guess I forgot the other Main question, since we setup a database connection in our main project. How do I overcome this problem with the second, third and so on database connection since it's new and the project obiously has the first connection. particulary dynamically.

You simply need to use Dynamic Permissions based on tables located in the client's database. When you clone the database, permissions tables and permissions themselves will be cloned and your new client will be ready to go.

So that is simple enough. But to ensure on each call in the project , I will need to initialize this before each query.
I remeber in other versions we had a common.php file . I want to put this in version 11 . where would I put this code in the new version so I don't have to use it on every page and/or event.
Or can I put this code in After Application Initialized for global use? So I don't have to call everytime.

function initializeCompanyDatabase() {
if (!isset($_SESSION['comid'])) {
redirect('login.php'); // Redirect to login if no company ID set
}

}

// Call this function at the start of each page/request
initializeCompanyDatabase();

You need to read SaaS application design article one more time:
https://xlinesoft.com/blog/2019/10/03/saas-application-design/

Okay , Thanks for the reply

Had to edit this. I still don't get what the blog image ( see image 1 at top it has 5 databases listed ) What is in those databases, or are they just connections. The image is confusing me.
Then below you have written :

"You can see that we have a common saasdb database here and multiple identical client databases. We only need to add to the project one of those client databases, database1 one in our example."

What are the other ones ( like are they empty clones - confusing ) ? Meaning do I have to add all the databases I plan to use in the future to the project as they will be created on the fly with a webhook after purchase?
or that image was just an example and I only need two database connection , 1 for users table and security and the other for the rest of the project and if so how is dynamic security going to work as they are different databases 1 for users table and one for the rest of the project as your example explains? When I go into admin area online , it will then just show the users table and the security table. How is it possible , it
wil show the all the tables from the other database?

What am I missing here?

I finally wrapped my head around it I believe. I clone the security settings for the Project database which you mentioned earlier.
I will have to test this method, as I still don't see how advanced security will work with the users table in another database , unless
in the project I can select the users table from the other database. I am good for now.

Thanks again for the replies.

Edited: Yes you can , This is solved .