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Create a conversion target for the ‘go to basket’ or ‘go to checkout’ conversion and make sure it becomes the point from which the attribution is frozen. This article explains you how to do so.
Make sure you define how long the attribution should remain frozen. You can do this in the main tracking settings of the advertiser.
Appoint another conversion target that will be the point on which the basket freeze will be applied. We are talking here about the conversion which should be attributed to a touch point generated before the customer reached the conversion target from which the attribution was frozen. In most cases, you will use the final commercial conversion target for this purpose.