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Tracking custom event properties for auto-tracked events

If you’re using one of our prebuilt source integrations, and you want to include custom properties (or modify existing properties) on these events, then you can do so using the set method. Imagine for example that I want to send a custom property with my Added To Cart event. I would then call the following function before the Added To Cart event is fired. 
cvg({method: "set", eventProperties: {hello:"world"}})
When my Added To Cart event fires, it will now include the custom hello -> world property mapping. You can modify profile properties in the same way, a full example of the function would be: 
cvg({method: "set", properties: {...profileProperties}, eventProperties: {...eventProperties}})
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