Certinia Billing Central API
Global Apex service classes for subscription and usage billing. BillingService, BillingDocumentsService, BillingSchedulesService, and ContractsService generate billing documents and schedules, manage contracts, pricing, discounts, products, and tax codes, and drive the bill-to-cash process. Invoked as Apex within a Salesforce org against Billing Central managed-package objects; endpoints modeled from the public developer reference.