Publisher Earnings Dashboard Development

I need a website where my publishers can log in and access a read-only Earnings Dashboard. The data will be pulled from Google Ad Manager API and should be displayed in a table format only (no graphs or charts).

Key Features:
Publisher Login System – Each publisher should have secure access to their dashboard.
Read-Only Earnings Dashboard – Publishers can only view their earnings.
Google Ad Manager API Integration – The dashboard should display:
Total Earnings
Impressions
Clicks
CPM
Subdomain-Based Data Filtering – Each publisher should only see data for their assigned subdomain.
Efficient Data Fetching – API requests should be optimized for performance.
Additional Requirements:
How I Manage Publishers: After launch, I need an easy way to add new publishers and assign subdomains to them.
Security: Ensure publishers can’t see each other’s data.
Scalability: The system should handle multiple publishers efficiently.

my project is focused on publisher earnings, I need to ensure each publisher only sees their subdomain’s data.

Also, how would you handle:

Authentication & access control to make sure publishers only see their own data?
Optimizing API requests to keep the dashboard fast and efficient?
Adding new publishers & assigning subdomains easily after launch?