//Create billing engine corresponds to given billingTaskConfigurations
Map<String, BillingTaskConfiguration> billingTaskConfigs =
billingConfiguration.getBillingTaskConfigs();
for (Map.Entry<String, BillingTaskConfiguration> entry : billingTaskConfigs.entrySet()) {
String billingTaskName = entry.getKey();
BillingTaskConfiguration billingTaskConfiguration = entry.getValue();
BillingEngine billingEngine =
new BillingEngine(billingTaskConfiguration, dataAccessObject);
billingEngines.put(billingTaskName, billingEngine);
}
billingManager = this;