Gusto

Gusto's file routes cover more than the API: you can add employees by CSV, import payroll inputs with Smart Import, and download reports or mapped accounting files. Fields, formats and access vary by route and report, so check the data your workflow needs. Embedded Payroll's documented models are separate from ordinary employer-account access.

It documents both direct connections and connector-based ones. What to confirm: which plan includes the connection you want, which records it moves, which direction they move, and what happens when a sync fails.

While API connections exist, access is limited. Gusto's App Integrations production access requires approval and security review for eligible software companies serving shared customers; a payroll account alone does not provide a private API for your own business. Check existing connectors and file routes first. Hiring a developer or partner does not itself secure access.

That comes down to whether the records you need are reachable, current, and clean enough to act on. Match the workflow you have in mind against the documented records and access paths before you scope it.

It varies by connection. Start with Access and Pricing, then confirm the current integration, automation, reporting, user, and add-on terms with the vendor before you commit.