Hi @Adiaobong.Odungide,
Sorry for the late reply, this is what I heard back from the Docs team.
The `key` is whatever you want to use to identify the custom data; the `value` is the data you want to capture and attach to the snapshot. The call to `txn.addSnapshotData()` can occur anywhere in your application where a transaction is in progress, either programmatically created via `appd.startTransaction(...)` or auto-discovered and retrieved via `appd.getTransaction(request)`. To add custom snapshot data to a transaction that's already being detected and reported, `getTransaction()` would be the required approach.
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