The fields a caller supplies to append one participation signal — the
ConsumerApi.append call shape. subject is required; kind defaults
to command, at to the game-time witness, realAt to the wall clock
(resolved by the ConsumerLogic append seam when omitted).
The fields a caller supplies to append one participation signal — the
ConsumerApi.appendcall shape.subjectis required;kinddefaults tocommand,atto the game-time witness,realAtto the wall clock (resolved by theConsumerLogicappend seam when omitted).