How to Create and Sync Invoices with Unified's Accounting API

Unified's Accounting API addresses the complexities and inconsistencies of invoicing across different accounting systems by providing a normalized and defensible approach to invoice automation. It standardizes the representation of invoices through the AccountingInvoice model, where classification occurs at the line-item level, and enforces lifecycle rules via the provider. The API supports core functionalities such as listing, syncing, creating, updating, delivering, and removing invoices while handling pagination, rate limits, and provider constraints. It enables the control of invoice delivery and payment behavior without relying on undocumented defaults, making it possible to manage invoices across various platforms without vendor-specific code paths. For continuous invoice sync or lifecycle tracking, the use of Unified webhooks is recommended over polling to manage retries, backoff, and initial sync efficiently.