Before you start
You need at least Campaign Manager permission level in the Bing Ads account you want to connect.
Steps
In Klar, go to Settings → Store Configurator → Data Sources and click Add New Data Source.
Select Bing from the list of available sources.
Give your integration a descriptive name and click Connect Bing Data Source.
Follow the login steps on the Microsoft authentication page.
Select the Bing account you want to connect from the list and click Connect Bing Data Source.
The connection is complete. Your Bing data is being imported and will appear in your reports within 12–24 hours.
Go to the Channel Builder and map your Bing account to your Bing Ads channel so it's included in attribution and reporting.
Troubleshooting: "invalid_client" error
If you see an invalid_client or AADSTS650052 error during the login step, this means the Microsoft Advertising app hasn't been added to your Microsoft tenant yet.
Fix: Your Azure Active Directory admin needs to run the following Graph API call:
POST https://graph.microsoft.com/v1.0/servicePrincipals
Content-type: application/json
{
"appId": "d42ffc93-c136-491d-b4fd-6f18168c68fd"
}
This adds the Microsoft Advertising application to your tenant. Once done, try connecting again.
⚠️ For more detail, see Microsoft's documentation: Authentication and OAuth — Microsoft Advertising

