Oracle Fusion Cloud ERP and Gusto integration

What moves between them

The main flow is Gusto into Oracle Fusion Cloud ERP. After each payroll run, ml-connector reads Gusto's payroll data and payroll registers, then posts the labor cost journals into Oracle Fusion's general ledger mapped to the matching GL accounts and cost centers. Employee records, including hires, terminations, and compensation changes, flow from Gusto into Oracle Fusion so your headcount and organizational dimensions stay current. Cost centers and departments are aligned in both directions so payroll allocations land on valid Oracle Fusion dimensions. Gusto payroll data is read from the API; Oracle Fusion GL postings are write-only, with no data flowing backward from the ERP to the payroll system.

How ml-connector handles it

ml-connector stores both OAuth credentials encrypted and refreshes the Gusto access token when it expires within the 2-hour window. On the Oracle Fusion side, it uses the customer-specific pod URL and stores the OAuth Client Credentials securely, refreshing the Bearer token as needed. ml-connector listens for Gusto webhook events on payroll submission and employee changes, then polls the Gusto API to fetch the full payroll registers and employee records. On the Oracle Fusion side, it polls the REST API every 5 to 15 minutes filtering by LastUpdateDate to detect GL account and cost center changes, ensuring payroll allocations only reference valid dimensions. Cost centers and departments are mapped and validated first, so every payroll journal line references a GL account and cost center that already exists in Oracle Fusion. ml-connector verifies Gusto webhook signatures using the HMAC-SHA256 header and handles rate limits (200 requests per minute in Gusto) with exponential backoff. Every record carries a full audit trail and can be replayed if a downstream GL posting fails.

A real-world example

A mid-sized professional services firm runs Oracle Fusion Cloud ERP for project accounting, AP, AR, and GL, with operations across three regions. Gusto handles payroll for 150+ employees split across regional offices and cost centers. Before the integration, the accounting team ran a manual payroll register export from Gusto each pay period and re-keyed labor costs into Oracle Fusion by hand, mapping employees to their regional cost centers. Month-end close involved chasing discrepancies between actual headcount in Gusto and the labor accounts reflected in Oracle Fusion's GL. With Gusto and Oracle Fusion connected, each payroll run's journal flows into Oracle Fusion automatically, allocated to the correct regional cost center and project code, and employee changes keep the two systems in agreement. Month-end close starts with labor accounts pre-reconciled, and the manual re-keying step is eliminated.

What you can do

• •Post Gusto payroll journals and pay registers into Oracle Fusion Cloud ERP's general ledger, allocated to the correct GL accounts and cost centers.
• •Keep Oracle Fusion employee records and organizational dimensions in sync with Gusto hires, terminations, and compensation changes.
• •Map Gusto pay schedules and locations to Oracle Fusion cost centers and departments so payroll lands on valid financial dimensions.
• •Authenticate Gusto with OAuth2, refresh tokens on expiration, and verify webhook signatures using HMAC-SHA256.
• •Poll Gusto and Oracle Fusion on a configurable schedule, with retries and a complete audit trail on every record.

Questions

Which direction does data move between Gusto and Oracle Fusion Cloud ERP?

The main flow is Gusto into Oracle Fusion Cloud ERP. Payroll journals, pay registers, and employee records move from Gusto into Oracle Fusion, while cost centers and departments are aligned in both directions so payroll allocations reference valid GL dimensions. Oracle Fusion GL documents are write-only for this integration, so payroll data does not flow backward from the ERP into Gusto.

How does ml-connector handle Gusto's OAuth2 tokens and webhook signatures?

ml-connector stores Gusto OAuth credentials encrypted and automatically refreshes the access token before it expires within the 2-hour window. On incoming webhooks for payroll and employee events, ml-connector verifies the signature using the HMAC-SHA256 header and subscription token, ensuring only authentic Gusto events trigger downstream GL postings.

What happens if an Oracle Fusion GL posting fails?

Every payroll journal and employee record is stored with a complete audit trail. If a posting to Oracle Fusion fails, ml-connector retries with exponential backoff and allows manual replay of the failed record once the underlying issue is resolved, so no payroll data is lost and you maintain full traceability in the audit log.