message: pricing - no model ==> old way
diff: @@ -29,7 +29,9 @@ export default class BuiltInPricingIntegration extends PricingIntegration<Simple
  public async stopSession(transaction: Transaction, consumptionData: Consumption): Promise<PricedConsumption> {
  const pricedConsumption = await this.computePrice(transaction, consumptionData);
  + if (transaction.pricingModel) {
  pricedConsumption.pricingConsumptionData = await PricingEngine.priceFinalConsumption(this.tenant, transaction, consumptionData);
  + }
  return Promise.resolve(pricedConsumption);
  }
  