Billing Apex Reference

Billing provides the ConnectApi namespace (also called Connect in Apex) that contains classes for accessing the same capabilities that are available in the Billing Business APIs. Additionally, you can use other built-in Apex classes and interfaces grouped by namespace.

This table lists the available Billing Apex methods with the associated Connect REST API.

Apex Method	Connect REST API
`convertNegativeInvoiceLines(ConvertNegativeInvoiceLinesInput, invoiceId)`	`Negative Invoice Lines to Credit Conversion (POST)`
`generateInvoices(inputRequest)`	`Invoices By Using Billing Schedules (POST)`
`recoverBillingSchedules(inputRequest)`	`Billing Schedule Recovery List (POST)`
`creditInvoice(CreditInvoiceInput, invoiceId)`	`Credit Memo Create and Apply (POST)`
`applyCreditMemos(CreditMemoApplyInput, creditMemoId)`	`Credit Memo Apply List(POST)`
`unapplyCreditMemos(CreditMemoUnapplyInput, creditMemoInvApplicationId)`	`Credit Memo Unapply (POST)`
`applyCreditMemoLines(CreditMemoLineApplyInput, creditMemoLineId)`	`Credit Memo Line Apply (POST)`
`unapplyCreditMemoLines(CreditMemoLineUnapplyInput, creditMemoLineInvoiceLineId)`	`Credit Memo Line Unapply (POST)`
`triggerInvoiceBatchDraftToPosted(invoiceBatchRunId)`	`Invoices Batch Draft to Posted Status (POST)`
`postDraftInvoices(inputRequest)`	`Invoice Draft to Posted Status (POST)`
`createCreditMemos(CreditMemoInputRequest)`	`Credit Memo Create and Apply (POST)`
`voidPostedInvoice(invoiceId)`	`Posted Invoice Voidance (POST)`
`calculateTax(calculateTax)`	`Tax Calculation (POST)`
`applyPaymentLine(PaymentLineApplyInput, paymentId)`	`Payment Line Apply (POST)`
`unapplyPaymentLine(PaymentLineUnapplyInput, paymentId, paymentLineId)`	`Payment Line Unapply (POST)`
`applyRefundLine(RefundLineApplyInput, refundId)`	`Refund Line Apply (POST)`
`reconcileSequences(sequenceGapReconciliationInputRepresentation)`	`Sequence Gap Reconciliation (POST)`
`sequenceAssignment(sequencesAssignmentInputRepresentation)`	`Sequence Assignment (POST)`
`voidPostedCreditMemo(VoidPostedCreditMemoInput, creditMemoId)`	`Void Posted Credit Memo (POST)`

For more information about Apex classes that are available for Commerce Payments, see CommercePayments Namespace.

ConnectApi Namespace

The ConnectApi namespace (also called Connect in Apex) provides classes to manage credit applications and billing scenarios.
InvoiceWriteOff Namespace

Create credit memos with the total charge amount on the invoice as the write-off amount and close the invoice.
IssueCreditMemo Namespace

Issue credit memos from disputed invoices. Use this namespace to create and apply credit memos against invoices or invoice lines based on dispute adjustments.
RulesAppln Namespace

Apply payments and credits to posted invoices by adhering to the specified rules.
TaxEngineAdapter Interface

Retrieves and evaluates the details from a tax engine to define tax details.