FB - low Click ID (fbc) matches on purchase event

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Since setting customer data sharing to maximum, we're sending click id (fbc) for just 33.33% of purchase event instances.

Click id (fbc) is available for 100% of our event instances, so how can we set it up so that it's sent from our store for 100% of event instances or as close to 100% as possible? We've generated an access token - where to put it?