SAP ECC and Gusto integration

What moves between them

Employee and compensation records flow from Gusto into SAP ECC on a schedule tied to your payroll cycle. New hires in Gusto trigger employee creation in SAP ECC master data (BAPI_EMPLOYEE_CREATE or direct table updates via RFC_READ_TABLE); terminations in Gusto update the employee status in SAP. Compensation changes in Gusto - salary, hourly rate, commission allocations - are read and mapped to SAP cost center dimensions so payroll labor costs post to the correct GL accounts during month-end close. Cost centers and payroll types are synchronized bidirectionally so Gusto compensation allocations reference only valid SAP cost center codes. No payroll documents are written back from SAP to Gusto; Gusto is the authoritative source for payroll.

How ml-connector handles it

ml-connector stores both credential sets encrypted and handles the on-premises RFC/OData transport by accepting the SAP Gateway base URL and agent connection parameters per customer. For write operations in SAP ECC, ml-connector calls BAPI_TRANSACTION_COMMIT after every employee or cost allocation update to ensure the document is committed and not locked. On the Gusto side, ml-connector refreshes the OAuth2 token whenever a call returns 401 and respects the 200 requests per minute rate limit with exponential backoff on 429 responses. Employee records are matched across the two systems using a local mapping table, since neither system exposes a cross-system ID. Compensation data arrives from Gusto as string decimals, so ml-connector parses them to numeric values before posting to SAP GL dimensions. Because SAP ECC has no webhooks, ml-connector polls both RFC and OData endpoints on a customer-configured schedule aligned to your payroll run dates. Every record carries a full audit trail and can be replayed if a downstream operation fails.

A real-world example

A mid-sized manufacturing company runs SAP ECC on premises for production scheduling and finance, and adopted Gusto for cloud payroll and HR across multiple locations. Before the integration, the HR team exported employee and compensation data from Gusto monthly and emailed it to the finance team, who hand-entered new hires, terminations, and rate changes into SAP, then spent days reconciling cost allocations against actual payroll totals during month-end close. With SAP ECC and Gusto connected, each employee change and compensation update flows into SAP automatically on payday, mapped to the correct cost center, and month-end close begins with all labor costs already allocated to the right GL accounts. The finance team reclaims 8 to 10 hours per month and eliminates the manual data-entry error risk.

What you can do

• •Sync new hires and terminations from Gusto into SAP ECC employee master data, keeping both systems aligned.
• •Map Gusto compensation rates and cost allocations to SAP cost centers and GL accounts so payroll labor costs land on the correct dimensions.
• •Handle OAuth2 token refresh on Gusto side and RFC/OData authentication on SAP ECC, with encrypted credential storage.
• •Poll Gusto and SAP on a payroll-calendar schedule since SAP ECC has no native webhooks, with automatic retry and audit trails.
• •Create cost center master records in SAP from Gusto location and department structures, and validate compensation allocations against those dimensions.

Questions

Does the integration require an on-premises agent to connect to SAP ECC?

Yes. SAP ECC RFC and BAPI calls cannot originate directly from the cloud, so the on-premises agent (SAP .NET Connector or Java Connector) must run on your network with credentials to access the SAP system. ml-connector accepts the agent connection parameters per customer and calls RFC endpoints through it. OData calls also go through the SAP Gateway on the same on-premises host.

How does ml-connector handle the differences between SAP ECC write BAPIs and Gusto OAuth2 tokens?

On the SAP side, ml-connector calls BAPI_TRANSACTION_COMMIT after every write operation to ensure employee and cost allocation changes are committed and not left in a locked state. On the Gusto side, ml-connector refreshes the OAuth2 token whenever a call returns 401 and respects the 200 requests per minute rate limit with backoff on 429 responses. Both flows carry full audit trails.

Which direction does data move and how often does the sync run?

The main flow is Gusto into SAP ECC. Employee records, compensation rates, and cost allocations move from Gusto into SAP on a schedule tied to your payroll cycle so changes are reflected before month-end close. Cost centers and payroll types can sync bidirectionally for validation. The schedule is customer-configured since SAP ECC has no webhooks to trigger automatic updates.