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Pixels fire tracking events as the video plays. items is a collection, so the merge works per item: an item with an id patches that pixel, an item without one creates a new pixel, and an item with "_destroy": true deletes it. Pixels you don’t mention stay as they are. This is a merge-patch: send only the keys you want to change and everything else keeps its stored value.

Fire a custom pixel at 50%

The keys