export function buildAdConversion(event: AdConversionEvent): PayloadBuilder {
  const { conversionId, costModel, cost, category, action, property, initialValue, advertiserId, campaignId } = event;
  const eventJson = {
    schema: 'iglu:com.snowplowanalytics.snowplow/ad_conversion/jsonschema/1-0-0',
    data: removeEmptyProperties({