---
title: v0.1.0
description: Billtyme's internal API foundation introduces multi-company accounts, authenticated customer and invoice commands, and generated OpenAPI documentation.
type: changelog
date: 2026-08-11
lastModified: 2026-08-12
changelog:
  version: "0.1.0"
  category: Foundation
---

Billtyme now has its first internal, agent-oriented API foundation.

## Included

- Nine Hono/OpenAPI operations for companies, customers, and draft invoices
- WorkOS organization-to-account identity and exact permission boundaries
- Multiple legal sender companies inside one account
- PostgreSQL 18 UUIDv7 IDs and composite tenant foreign keys
- Retry-safe writes using idempotency keys
- Exact draft calculations and persisted issuer and customer snapshots
- Drizzle-defined constraints for document lifecycle, totals, numbering, and tenant ownership
- A deterministic OpenAPI 3.1 artifact
- A Blume landing page, guides, search, exports, and generated API reference

## Not included yet

Public estimates, invoice numbering, PDF preview, approval, issuance, sending, the operational MCP server, and Ask AI remain future work.