billing-integration-apex

Use when programmatically generating invoices, integrating payment gateways, automating credit notes, or calling Salesforce Billing Apex APIs (blng.InvoiceAPI, blng.TransactionAPI) from custom Apex code. Trigger keywords: billing apex, blng.InvoiceAPI, blng.TransactionAPI, payment gateway adapter, invoice generation apex, credit note apex, programmatic invoice. NOT for admin billing setup, billing rule configuration, billing policy UI, or Invoice Run scheduling.