SYSPRO and Gusto integration

What moves between them

Employee records flow from Gusto into SYSPRO's employee master, with new hires, updates, and terminations processed as they occur or on a scheduled reconciliation. Job codes, earning types, compensation rates, and pay schedules from Gusto are matched to SYSPRO job masters and payroll dimensions. GL accounts and cost centers are read from SYSPRO to validate that every payroll allocation in Gusto references a dimension that exists in the ERP, preventing mismatches at month-end close. The sync runs on a cadence you define, typically daily or after each payroll processing.

How ml-connector handles it

ml-connector stores both credential sets encrypted and maintains a session token for SYSPRO via the Logon endpoint, refreshing when timeout or logoff occurs. For Gusto, it exchanges the authorization code for an OAuth2 access token and refreshes automatically when the token expires in 2 hours, rotating the refresh token per Gusto policy. It receives Gusto payroll and employee events at the webhook endpoint, verifies signatures with the HMAC-SHA256 key, and deduplicates using Gusto's object versioning (every PUT includes the version field to prevent 409 conflicts). On the SYSPRO side it polls OData tables with $filter on PostDate and other timestamp fields to detect new or changed employee and payroll records, and reads GL accounts and cost centers to build the validation table. When a payroll record in Gusto references a cost center or GL account not found in SYSPRO, ml-connector queues the record for manual review rather than writing incomplete data. It tracks the SYSPRO session token lifetime and the Gusto token expiry so a renewal does not interrupt the sync. Every record carries a full audit trail and can be replayed if a downstream call fails.

A real-world example

A mid-sized manufacturer runs SYSPRO ERP for production and accounting and uses Gusto for payroll and benefits across three locations. Before the integration, the HR team exported new hires and terminations from Gusto each month and manually entered them into SYSPRO's employee master, and the payroll team re-entered earning codes and cost center allocations by hand. With SYSPRO and Gusto connected, new hires flow into SYSPRO automatically on their Gusto start date, changes to pay rates and job codes sync from Gusto to the payroll master, and every payroll allocation is validated against the GL accounts and cost centers already set up in SYSPRO. Month-end close starts with payroll and employee records already aligned, and the manual data entry work is gone.

What you can do

• •Sync employees, jobs, and compensation from Gusto into SYSPRO's payroll and employee masters in real time or on a schedule.
• •Validate that every payroll allocation in Gusto references a GL account and cost center that exists in SYSPRO.
• •Handle Gusto OAuth2 tokens that expire in 2 hours and SYSPRO session tokens that timeout, refreshing each automatically.
• •Receive and verify Gusto webhook signatures with HMAC-SHA256 and deduplicate events using Gusto's object versioning.
• •Poll SYSPRO OData and e.net Business Objects APIs to detect changes and keep reference data in sync, with retries and a full audit trail.

Questions

Which direction does data flow between SYSPRO and Gusto?

The main flow is from Gusto into SYSPRO. Employees, jobs, compensations, earning types, and pay schedules move from Gusto into SYSPRO's payroll master. GL accounts and cost centers are read from SYSPRO to validate payroll allocations in Gusto. This is a pull-based validation, not a write-back.

Why does the integration validate GL accounts and cost centers?

SYSPRO operates on specific GL dimensions for payroll posting. If a Gusto payroll record allocates an earning to a cost center or GL account that does not exist in SYSPRO, the posting will fail or land on the wrong dimension. ml-connector prevents this by checking every allocation against SYSPRO's master data and flagging mismatches before they reach the ERP.

How does the integration handle Gusto webhooks and SYSPRO polling at the same time?

ml-connector receives Gusto webhook events in real time (payroll calculated, submitted, processed, employee onboarded, terminated) and verifies their signatures. For SYSPRO, which has no webhooks, it polls OData tables with filters on timestamp fields like PostDate to detect changes on a schedule you control. This hybrid approach gives you both the speed of webhooks from Gusto and the reliability of scheduled polling from SYSPRO.