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Common callback information. Specific CallbackInfo messages should embed this and may include additional fields.
Used in:
Information on how this callback should be invoked (e.g. its URL and type).
The time when the callback was registered.
The current state of the callback.
The number of attempts made to deliver the callback. This number represents a minimum bound since the attempt is incremented after the callback request completes.
The time when the last attempt completed.
The last attempt's failure, if any.
The time when the next attempt is scheduled.
If the state is BLOCKED, blocked reason provides additional information.