For AI agents: visit https://x-series-api.lightspeedhq.com/v2026.01/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI. Append .md to any documentation page URL to get its markdown version.

Added

2021-09 New Serial Numbers API

about 5 years ago by ReadMe API

We are now providing a simple API for both reading and writing serial numbers.

2.0 Serial Numbers API Reference