The API Report CardAPI Index
Sling

Sling API

POS / Hospitality · getsling.com

Sling ships a documented public REST API at api.getsling.com with a Swagger UI, self-serve for any admin account. The OAuth2 refresh-token flow is openly broken, forcing full re-login when hourly access tokens expire. No webhooks and no published rate limits, so integrations poll.

Last verified: October 2026HR & PayrollNO MCP
API GRADE
C
VERIFIED OCT 2026

SCORECARD

ExistenceGOODA documented public REST API at api.getsling.com with a Swagger UI and example scripts on GitHub.
AccessMIXEDSelf-serve for any Sling admin account, but there is no formal partner program or ISV listing.
CoverageMIXEDShifts, timesheets, time off, availability, and messaging are covered; with no webhooks, everything is polled.
AuthPOOROAuth refresh flow is broken, forcing a full re-login when tokens expire, and the legacy token arrives only in a response header.
Docs & DXMIXEDThe Swagger UI lists endpoints but schemas and error codes run thin; the GitHub docs repo is marked as a WIP migration.
StabilityMIXEDNo published rate limits; integrators discover throttling through 429s with no documented backoff guidance.
MCPNONENo official MCP server was found for Sling. A single small community repo exists but has seen no activity since late 2025 and does not meet the bar for a maintained server. VERIFIED 2026-08
Supergood turns hard-to-integrate enterprise software into clean REST APIs and MCP tools: stable endpoints, normalized JSON, managed auth.

Frequently asked questions

Sling scores C on Supergood's API Report Card. Sling ships a documented public REST API at api.getsling.com with a Swagger UI, self-serve for any admin account. The OAuth2 refresh-token flow is openly broken, forcing full re-login when hourly access tokens expire. No webhooks and no published rate limits, so integrations poll.

Tried to integrate with Sling?
SOURCES
OAuth refresh-token flow is broken - after the access token expires (~3600s) there is no working endpoint to exchange the refresh_token for a new access token, forcing integrators to re-run the full login flow github.com ↗
Public getsling-api-docs GitHub repo is explicitly marked 'WIP / currently being migrated' with 7 open issues, suggesting documentation is stale and incomplete github.com ↗
Swagger UI at api.getsling.com is sparse - endpoints are listed but request/response schemas, error codes, and pagination semantics are thinly documented compared to peers like 7shifts api.getsling.com ↗
No public webhooks - integrators must poll the API for shift, timesheet, and time-off changes, which is expensive at scale and causes change-detection lag github.com ↗
No published rate-limit documentation - integrators discover limits empirically via 429s, with no documented backoff guidance api.getsling.com ↗
Authorization token is returned only in the response header of /account/login (not the body), tripping up integrators who follow standard REST-client patterns and only inspect response bodies help.paxflow.io ↗
Post-Toast acquisition, third-party integrators report uncertainty about long-term API stability and roadmap, as Toast prioritizes its own POS/Payroll bundle community.n8n.io ↗
Mobile app sync delays - schedule changes don't always push to the app immediately and shifts can display differently on phone vs desktop capterra.com ↗
Mobile app feels slow or glitchy at times, with occasional crashes and stale data g2.com ↗
2024 product change restricted shift-swap visibility to managers only, removing peer-to-peer swap transparency that employees and ops leads relied on capterra.com ↗
30-user hard cap on the Free plan forces small businesses to upgrade as they grow, even before they need Premium features turnozo.com ↗
Limited reporting on lower tiers - advanced labor analytics and budget reporting are gated behind the Business plan capterra.com ↗
Time-clock geofencing accuracy issues - some users report clock-in/out failing or registering outside the geofence in dense urban environments g2.com ↗
Customer support response times degraded post-Toast acquisition; tickets routed through Toast support tiers add friction capterra.com ↗
Lacks deeper HR functionality (performance management, formal onboarding workflows, document storage) compared to full HCM suites connecteam.com ↗