toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (adGroupId != null) 'adGroupId': adGroupId!,
if (interactionType != null) 'interactionType': interactionType!,
if (previousStepId != null) 'previousStepId': previousStepId!,
if (stepId != null) 'stepId': stepId!,
};