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GA4 web and app analytics come into SourceMedium for traffic and attribution. The OAuth connection reads the Data API. The BigQuery export reads the property’s event tables, for funnel views and multi-touch attribution.

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How to connect

Sign in to SourceMedium, open your store, then choose Data sources → Connect data source and select the platform. You need an Admin or Editor workspace role.After you connect explains the first sync and connection statuses.
Most stores only need the OAuth connection. Connect the BigQuery export when you want those event tables, or when the property already exports them.

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Option 1: Connect with OAuth

1

Start the GA4 connection

Find GA4 in the connector picker and click Connect. The Connect GA4 page opens on the Authorize step.
2

Authorize with GA4

Click Authorize with GA4. SourceMedium sends you to Google in the same tab to approve the read-only Analytics access it requests, then brings you straight back. Sign in with an account that has access to your GA4 property. SourceMedium reads Analytics data only; it does not change anything in GA4.
3

Select the GA4 property

Back in SourceMedium, pick the GA4 property you want to sync, then save.
4

Confirm it is connected

The flow finishes on Done and the connection shows Connected. SourceMedium begins syncing sessions, events, transactions, and item-level ecommerce from the GA4 Data API.

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Option 2: Connect the BigQuery export

Google allows one BigQuery link on a property.
1

Start GA4 BigQuery Export

Find GA4 BigQuery Export in the connector picker and click Connect.
2

Authorize

Click Authorize with GA4 BigQuery Export. Sign in with a Google account that can edit the property. SourceMedium creates the link, then brings you back to pick the property.
3

Save the property

Pick the GA4 property and click Save property. Google writes the export to a dataset named analytics_ plus that property id.
If the picker says the property is already linked to a BigQuery project, leave that link where it is and record the dataset below. Moving the link into SourceMedium’s project can pause the export while Google switches.

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The export already exists

Connect GA4 and select the property first (Option 1). The dataset Google created is named analytics_ plus that property id.
1

Copy the dataset path

Open BigQuery. In Explorer, expand your project, open Datasets, and click that dataset.At the top of the dataset, click the copy button next to the path. It looks like my-project.analytics_123456789. Copy the path, not a table.
Dataset analytics_123456789 selected in BigQuery, with the copy button next to my-project.analytics_123456789.

Copy button next to the dataset path

2

Paste it on the GA4 connection

In SourceMedium, open the GA4 connection. Under BigQuery export, paste the path into BigQuery dataset path.
3

Save after the check

SourceMedium checks that it can read the dataset. Save dataset turns on when the check passes. Click it, then confirm Read this BigQuery export.An empty dataset is fine. The first daily table usually shows up the next day. If the tables are not daily event tables (events_YYYYMMDD), the check says this is not a GA4 export.
Sessions and transactions can change on the next warehouse refresh. Reporting switches from the Data API to this export.
If SourceMedium cannot read the dataset, grant the SourceMedium runtime account BigQuery Data Viewer on the project and try again. To change the path later, open GA4 BigQuery Export for this store. The field is under Export. Disconnect BigQuery export stops SourceMedium from reading the dataset. Google keeps exporting until you remove the link in Google Analytics.

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What data syncs

The OAuth path uses the GA4 Data API. It lands: Dates use the GA4 property timezone, not UTC. GA4 can emit more than one purchase event for the same transaction, so dedupe by transaction ID before summing revenue. Once a BigQuery export is connected, reports use those event tables instead of the Data API.