Want to track extra data with your conversions?
Event data is here!
Previously, you could only use transaction ID with conversions to track conversion-specific info.
Now, we have introduced two new "event data" attributes that are passable in postbacks, JS and API uploads.
You can find them in the tracking codes section:

You can also show them in the report builder, and as columns in raw events:


These fields will allow you to send cusotm data about conversions AND custom events. They do not impact deduplication like transaction IDs do.
The fields support up to 1024 characters, so you can also send multiple bits of data with some separators, or some JSON that you can digest and use later with API-based queries.