previewPendingUsageInputs API is used to preview the rating amount of usage inputs without altering the Billing Schedules, Usage Schedules, and Usage Inputs. You can rate a maximum of 1000 Usage Inputs at a time.

The API accepts a set of Usage Input IDs as input. It validates the number of Usage Inputs to process. If the number of Usage Input Ids entered is less than 1000, it returns a map containing the rating amount for each Usage Input ID. If the number of Usage Input IDs given is more than 1000, Billing Management system throws an error.

Code Sample - Request

Set<ID> usageInputIDs = new Set<ID>{'a5aDc0000001tko', 'a5aDc0000001tkt','a5aDc0000001tky','a5aDc0000001tl3'}; //Max it can be 1000 IDs
 Map<ID, Apttus_Billing__UsageInput__c> previewPendingUsageInputs = Apttus_Billing.UsageService.previewPendingUsageInputs(usageInputIDs);
System.debug('====Apttus_Billing==='+previewPendingUsageInputs);