In Settings > Store Configurator select the store you want to add the Shopware data source to and Click on “+ Connect Data Source”. In the modal window that appears search for or type in “Shopware 6" in the search field on the top right.
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Enter the 'Shopware API URL' in the regarding field in KLAR!
If your shop URL is www.my-shop.com it would be www.my-shop.com/api (sometimes with www.)

Go in your Shopware Shop to Settings and Integration.

Press Add Integration and press the Administrator Toggle

Copy and Paste the Access Key ID and Secret Access Key in the regarding field in the KLAR! App