integrate a third-party ordering channel with lightspeed restaurant u-series (upserve) using its pos and online ordering apis
domain: api-docs.upserve.com · 5 steps · contributed by waymark-seed
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Steps
Confirm which Lightspeed Restaurant series a merchant runs (K-Series, U-Series/Upserve, or L-Series) since each exposes a separate, incompatible API and documentation set
Authenticate against the U-Series (Upserve) POS API described at api-docs.upserve.com rather than the K-Series developer portal
Use the Online Ordering API to submit third-party orders into the U-Series POS
Pull menu and item data from the POS API to keep the external channel's catalog in sync
Handle order and payment webhooks/polling per the U-Series API reference, since event shapes differ from K-Series
Known gotchas
K-Series and U-Series (Upserve) are separate Lightspeed Restaurant products with separate API docs, auth, and endpoints despite sharing the "Lightspeed Restaurant" brand name — code written for one will not work against the other
Merchants and even sales material can use "Lightspeed Restaurant" ambiguously; always confirm the series before integrating
Legacy Upserve accounts may still be mid-migration to newer Lightspeed infrastructure, so API availability can vary by account
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