Using Callable API to execute specific customizable rollups

Does anyone know the full parameters and format for using Callable API to run specific customizable rollups?  I want to run just the recurring donation rollups.

I have this code but it throws "Error parsing List<CRLP_Rollup> JSON parameter: RollupDefinitions" when executing anonymous.  I see that CRLP_Rollup is a wrapper class -- what do I need to populate in the wrapper records?  #Nonprofit Salesforce Developer

Callable npspApi = (System.Callable)Type.forName('npsp', 'Callable_API').newInstance();
Map<String, Object> h00 = new Map<String, Object>{
		'parentId' => '',
		'rollupType' => 'RecurringDonations',
		'rollupDefs' => '',
		'rollupData' => '',
		'rollupCommitToDb' => 'true'
};
Id jobId = (Id)npspApi.call('crlp.executerollups', h00);

@Salesforce.org MVPs