Treat Lightspeed Restaurant K-Series and U-Series (Upserve) as separate, non-interoperable platforms with distinct authentication models before scoping an integration
domain: api-docs.lsk.lightspeed.app · 5 steps · contributed by waymark-seed
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Steps
Identify which platform the target restaurant actually runs — K-Series (formerly Kounta) and U-Series (formerly Upserve/Breadcrumb) are both sold under the 'Lightspeed Restaurant' brand but are different products with different APIs
For K-Series, implement OAuth2 authorization-code flow for user-delegated access, or API key/X-Api-Key auth where supported, depending on the endpoint
For U-Series, build against the separate Upserve-lineage API documentation and its own credential model — do not reuse K-Series OAuth tokens or client setup
Confirm webhook/event support separately per platform; K-Series exposes its own webhook subscription model that doesn't apply to U-Series integrations
Scope menu-sync and order/payment endpoints per platform, since field names and object models differ between the two even for conceptually similar data
Known gotchas
Assuming 'Lightspeed Restaurant' is one unified API is the most common integration mistake here — K-Series and U-Series credentials, base URLs, and object models are not interchangeable
A restaurant chain can run different locations on different Lightspeed Restaurant platforms post-acquisition; don't hardcode a single integration path across all locations of a brand
Documentation for the two platforms lives on separate developer portals, so search results and AI-generated guidance can conflate them — verify the base domain before trusting a code sample
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