If you choose to integrate with Google Analytics 4 client-side (either with Segment's Google Analytics 4 Web destination or outside of Segment)_and_ also use Segment's Google Analytics 4 Cloud destination to send events through the API, you will have all the reserved parameters and sessions tracking information available in Google Analytics 4 reports.

When using Gtag,[Google generates a`session_id` and`session_number` when a session begins](https://support.google.com/analytics/answer/9191807?hl=en){:target='_blank'}. The`session_id` and`session_number` generated on the client can be passed as Event Parameters to stitch events sent through the API with the same session that was collected client-side. For events to stitch properly, server-side events must arrive within a 48 hour window of when the client-side events arrive.

When using Gtag,[Google generates a`session_id` and`session_number` when a session begins](https://support.google.com/analytics/answer/9191807?hl=en){:target='_blank'}. The`session_id` and`session_number` generated on the client can be passed as Event Parameters to stitch events sent through the API with the same session that was collected client-side.Additionally,`client_id` must be the same for both client-side and server-side events in order to deduplicate user counts in GA4 (unless User-ID is used as the basis for user identification).For events to stitch properly, server-side events must arrive within a 48 hour window of when the client-side events arrive.

You can check your`session_id` and`session_number` with the[Google Site Tag function](https://developers.google.com/tag-platform/gtagjs/reference){:target='_blank'} or by running this script in your JavaScript console and replacing`G-xxxxxxxxxx` with your Google Analytics 4 Measurement ID:

You can check your`client_id`,`session_id` and`session_number` with the[Google Site Tag function](https://developers.google.com/tag-platform/gtagjs/reference){:target='_blank'} or by running this script in your JavaScript console and replacing`G-xxxxxxxxxx` with your Google Analytics 4 Measurement ID:

const sessionIdPromise=newPromise(resolve=> {

gtag('get','G-xxxxxxxxxx','session_number', resolve)

});

Promise.all([sessionIdPromise, sessionNumPromise]).then(function(session_data) {

const clientIdPromise=newPromise(resolve=> {

gtag('get','G-xxxxxxxxxx','client_id', resolve)

});

Promise.all([sessionIdPromise, sessionNumPromise, clientIdPromise]).then(function(session_data) {

console.log("session ID:"+session_data[0]);

console.log("session Number:"+session_data[1]);

console.log("client ID:"+session_data[2]);

});