This page lists the objects and its description.

Object NameDescription
Billing MetricRepresents a billing metric for a product or service.
Billing PlanRepresents a billing plan associated with a product or service. 
Billing Plan Line Item Represents a billing plan line item.
Billing ScheduleRepresents a billing schedule for a product or service.
Billing Plan TemplateRepresents the template to create a billing plan.
Billing Plan Template Line ItemRepresents a billing template plan line item.
Credit Memo Line Item Tax BreakupRepresents the tax break up for a Credit Memo Line Item (which is usually based on an Order).
Credit Memo Line ItemRepresents a single item in a credit memo.
Credit Memo Tax BreakupRepresents the tax break up for a Credit Memo (which is an aggregation of the Credit Memo Line Item Tax Breakups).
Credit MemoRepresents a credit memo associated with an account.
Gateway CommunicationRepresents request and responses during a communication with a 3rd party Gateway.
Gateway TransactionUsed to store the data from a specific payment/refund transaction (ex: authorization request or capture request and result).
Invoice Line Item Tax BreakupRepresents the tax breakup for an Invoice Line Item (which is usually based on an Order).
Invoice Line ItemRepresents a single item in an invoice.
Invoice Run ResultShows the list of invoices created by an associated invoice run.
Invoice RunRepresents an Immediate or Scheduled invoice creation batch job.
Invoice Tax BreakupRepresents the tax breakup for an Invoice (which is an aggregation of the Invoice Line Item Tax Breakups).
InvoiceRepresents an invoice associated with an account.
Payment MethodStores the information needed to process a payment.
PaymentRepresents a payment.
RefundRepresents Refunds given to the customer.
Related A/Rtransaction 2Represents a single AR transaction related to the Invoice, Credit Memo, Payment, Refund etc..
Related A/R TransactionRepresents a single AR transaction related to the Invoice, Credit Memo, Payment, Refund etc..
Temporal InputObject used to contain input fields required by pages that need to leverage apex:inputfield when gathering input for user driven actions (like creating Invoices)
Usage InputThe usage input for a product or service.
Usage ScheduleRepresents a usage schedule for a product or service.