message: billing - todo???
diff: @@ -29,7 +29,7 @@ export default interface NotificationTask {
  sendComputeAndApplyChargingProfilesFailed(data: ComputeAndApplyChargingProfilesFailedNotification, user: User, tenant: Tenant, severity: NotificationSeverity): Promise<void>;
  sendSessionNotStarted(data: SessionNotStartedNotification, user: User, tenant: Tenant, severity: NotificationSeverity): Promise<void>;
  sendEndUserErrorNotification(data: Partial<EndUserErrorNotification>, user: User, tenant: Tenant, severity: NotificationSeverity): Promise<void>;
  - // TODO : Delete sendBillingNewInvoice ??
  + // TODO : Delete sendBillingNewInvoice ???
  sendBillingNewInvoice(data: BillingNewInvoiceNotification, user: User, tenant: Tenant, severity: NotificationSeverity): Promise<void>;
  sendBillingNewInvoicePaid(data: BillingNewInvoiceNotification, user: User, tenant: Tenant, severity: NotificationSeverity): Promise<void>;
  sendBillingNewInvoiceOpen(data: BillingNewInvoiceNotification, user: User, tenant: Tenant, severity: NotificationSeverity): Promise<void>;
  