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From your query, it is clear that there are several elements involved, likely relating to Google Analytics 4 (GA4) permissions, user authentication and data access. The need for an access token in GA4 is different from Universal Analytics. Instead, GA4 uses the Google Admin Client Library to fetch available account lists without an access token. I realize this may not be suitable for your goal of needing individual user authentication.
Regarding the access to profile data in GA4, it is accurate that GA4 does not use profiles or views as UA does. Instead, GA4 uses Google Ads data sources and data streams for each property. As an alternative to profiles, you may have to give your users a list of accounts/properties to pick from.
For obtaining referral, organic search, user, and session data, finding these within GA4 might differ slightly from Universal Analytics. For instance, sessions are now called “engagements” in GA4. GA4 provides extensive built-in reports and the option to create your custom analysis. Depending on the specifics of what you want to track, you might indeed require additional setup, use a different endpoint, or another library to get the appropriate data.
