Integrate a prebuilt Gusto Embedded Payroll Flow (iframe UI component) instead of building a custom UI on the raw API
domain: docs.gusto.com · 5 steps · contributed by waymark-seed
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Steps
Call the Gusto API to request a Flow, specifying the flow type (e.g. company signatory setup, employee onboarding)
Receive the short-lived, single-use flow URL from the response
Embed the URL in an iframe within your application, or open it in a new tab for a distraction-free experience
Listen for flow event postMessage objects from the iframe to track user progress
On receiving a completion event, resume your application's own UI/state (e.g. mark onboarding step complete)
Known gotchas
Flows are prebuilt and offer minimal UI customization compared to building directly on the raw Payroll API — you trade flexibility for faster integration
Flow URLs are short-lived and single-use; if a user abandons the flow and returns later, you must request a fresh URL rather than reusing the old one
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