private void ContinueSagaInstance <TPayload>(TPayload payload, Func <TPayload, TKey> getKey, Action <ISagaContext <TState, TKey>, TPayload> onReceive)
{
var key = getKey(payload);
var context = _repository.Get(key);
onReceive?.Invoke(context, payload);
CheckStateCompletion(context, key, context.State);
}
