> ## Documentation Index
> Fetch the complete documentation index at: https://docs.invoca.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Capture the Session ID for Multiple Data Streams

> Create a separate Marketing Data field for each session ID you need to capture through a single Invoca Tag, then map each to its own GA4 configuration.

## Applies to

Google Analytics 4

## Objective

By capturing and passing the Google Analytics session IDs, you can understand which marketing campaigns and pages are driving each type of call or Signal in GA4 reports.

## Steps

1. Create a Marketing Data field for each Data Stream's session ID you need to capture through the Invoca Tag. For example, if you're capturing two session IDs, create two separate Marketing Data fields.
2. In the Invoca Tag, add each session ID using the Marketing Data fields you just created.
3. Add each session ID to its corresponding GA4 configuration or Data Stream in the integration settings.

## Where to go next

* [How to Expose the Google Analytics Session ID in the JavaScript Data Layer from Google Tag Manager](/s/article/expose-ga-session-id-javascript-data-layer-gtm)
* [Creating Marketing Data Fields](/s/article/creating-marketing-data-fields)
* [Filter Call Data for Multiple GA4 Properties](/s/article/filter-call-data-multiple-ga4-properties)