// The following starts the creation of the CIRS and, after that is done, the rollup will be automatically started.

ADvendio.CampaignItemRevenueSplit cirs = new ADvendio.CampaignItemRevenueSplit(0);
cirs.rollUpCurrentFiscalYearFilterIsEnabled = false;
Database.executeBatch(cirs, 200);

// The following starts the creation of the CIRS only for one/or more Media Campaign. Just list the IDs.

ADvendio.CampaignItemRevenueSplit.execute(new List<Id>{'a1F2G00000FJKqVUAX'});