Which direction does data move between SYSPRO and Paychex?

The main flow is Paychex into SYSPRO. Worker records, pay components, and checks move from Paychex into SYSPRO, and organizations and locations are mapped to SYSPRO cost centers. SYSPRO is write-capable, so ml-connector can create and update worker and pay records. SYSPRO does not push data back to Paychex.

How does the integration handle the different authentication models?

ml-connector stores SYSPRO session credentials encrypted and calls Utilities/Logon to obtain a session token, which is re-acquired on expiry. For Paychex, it uses OAuth2 Client Credentials, stores the credentials encrypted, and refreshes the access token proactively before it expires. Both sides are handled transparently; you provide the credentials once at setup.

Does SYSPRO's lack of webhooks affect the sync?

Yes. Because SYSPRO has no webhook system, ml-connector polls Paychex checks and pay components on a fixed schedule. Paychex webhooks are supported as notifications, but ml-connector also polls as a fallback to ensure no data is missed, since Paychex webhooks have no delivery guarantees. You control the polling interval based on your payroll calendar.

SYSPROPaychex

SYSPRO and Paychex integration

SYSPRO runs manufacturing and distribution operations. Paychex runs payroll and HR. When the two are connected, worker records and payroll data from Paychex flow into SYSPRO so your production system stays aligned with your payroll. New hires and terminations in Paychex are reflected in SYSPRO, and pay component data can be mapped to SYSPRO cost centers and inventory allocations. ml-connector bridges the very different APIs and auth models on each side and moves the data on a schedule you control.

How SYSPRO works

SYSPRO 8 is available cloud and on-premise and exposes suppliers, purchase orders, invoices, GL accounts, cost centers, items, warehouses, and more through three API layers: e.net Business Objects (REST/SOAP, read and write), OData (REST GET only), and Workflow Service (REST/SOAP, limited). e.net requires a session token obtained by logging in to the Utilities/Logon endpoint with an operator code and password. OData uses HTTP Basic Auth with SQL credentials. SYSPRO publishes no shared hostname; each customer provides their own server URL. There is no webhook system for outbound notifications, so all data retrieval is by polling.

How Paychex works

Paychex Flex is a cloud payroll and HCM platform that exposes companies, workers, jobs, organizations, locations, pay components, checks, and pay periods through a REST API secured by OAuth2 Client Credentials. Application registration and approval at developer.paychex.com is required. Paychex supports webhooks for worker and company events, but the webhook payloads are notifications only; the actual data must be fetched via GET endpoints. The API has no documented ordering or deduplication guarantees for webhooks, and there is no refresh token mechanism, so access tokens must be re-acquired proactively before expiry.

What moves between them

The main flow runs from Paychex into SYSPRO. Worker records, pay components, and checks are read from Paychex either by polling on a fixed interval or by receiving webhook notifications and then fetching the full data via GET. Organizations and locations in Paychex are mapped to cost centers and departments in SYSPRO. Worker hire, termination, and rehire events keep SYSPRO headcount aligned with Paychex. Pay component allocations and check totals can be posted to SYSPRO as labor cost records linked to the mapped cost centers. Reference data such as organizations, locations, and job codes are synced to keep Paychex dimensions valid in SYSPRO. SYSPRO is read and write via e.net Business Objects, so pay records and mappings can be created and updated.

How ml-connector handles it

ml-connector stores both credential sets encrypted: the SYSPRO session token (obtained by calling Utilities/Logon with operator credentials) and the Paychex OAuth2 client credentials. It maintains the SYSPRO session and re-authenticates if the token expires. For Paychex, it tracks OAuth2 token expiry and refreshes credentials proactively before they become invalid. On the Paychex side, ml-connector can receive webhook notifications for worker and company events and must call the GET endpoints to fetch full data. On the SYSPRO side, it calls e.net Business Objects methods to write worker records and pay components as they arrive. Organizations in Paychex are mapped to SYSPRO cost centers first, so every pay record references a valid SYSPRO dimension. Because Paychex webhooks carry no ordering guarantees and may not be delivered, ml-connector also polls Paychex checks and pay components on a fixed schedule as a fallback and uses Paychex check IDs as idempotency keys to avoid duplicate writes into SYSPRO. Every record carries a full audit trail, so failed posts can be retried or replayed once the downstream system is recovered.

A real-world example

A mid-sized distribution company operates SYSPRO for order management, purchasing, and general ledger work, and uses Paychex Flex for payroll and HR across three regional warehouses. Before integration, when new warehouse staff were hired in Paychex, the office manager manually added them to SYSPRO after the hire was confirmed. When pay periods closed, the accounting team exported pay totals from Paychex and manually allocated labor costs to the correct SYSPRO cost centers. With SYSPRO and Paychex connected, new hires appear in SYSPRO automatically, and pay allocations post to the ledger without re-keying. The payroll reconciliation that used to take a full day is now a 30-minute check.

What you can do

Sync Paychex worker records (hire, termination, rehire) into SYSPRO so headcount and employee data stay aligned.
Map Paychex organizations and locations to SYSPRO cost centers and departments.
Read pay components and checks from Paychex and post labor cost records to SYSPRO's general ledger.
Receive Paychex webhook notifications and poll as a fallback to ensure no pay records are missed.
Authenticate SYSPRO with session tokens and Paychex with OAuth2 Client Credentials, with automatic expiry management and retry on both sides.

Questions

Which direction does data move between SYSPRO and Paychex?: The main flow is Paychex into SYSPRO. Worker records, pay components, and checks move from Paychex into SYSPRO, and organizations and locations are mapped to SYSPRO cost centers. SYSPRO is write-capable, so ml-connector can create and update worker and pay records. SYSPRO does not push data back to Paychex.
How does the integration handle the different authentication models?: ml-connector stores SYSPRO session credentials encrypted and calls Utilities/Logon to obtain a session token, which is re-acquired on expiry. For Paychex, it uses OAuth2 Client Credentials, stores the credentials encrypted, and refreshes the access token proactively before it expires. Both sides are handled transparently; you provide the credentials once at setup.
Does SYSPRO's lack of webhooks affect the sync?: Yes. Because SYSPRO has no webhook system, ml-connector polls Paychex checks and pay components on a fixed schedule. Paychex webhooks are supported as notifications, but ml-connector also polls as a fallback to ensure no data is missed, since Paychex webhooks have no delivery guarantees. You control the polling interval based on your payroll calendar.

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