Paychex External API
★ Only Publicly Available OpenAPI DocumentHR recruitingPayrolloauth297 EndpointsREST
For Agents
Manage workers, process payroll checks, configure compensation rates, and handle direct deposits for companies using Paychex payroll services.
Use for: I need to add a new worker to the company payroll, I want to update an employee's direct deposit information, Retrieve the pay statement details for a specific worker, Check whether a payroll check has been processed
Not supported: Does not handle benefits enrollment, time tracking, or recruiting — use for payroll processing and worker records management only.
Jentic publishes the only available OpenAPI specification for Paychex External API, keeping it validated and agent-ready. The Paychex External API provides programmatic access to company payroll data, worker management, compensation, tax filings, and direct deposits. It covers 97 endpoints spanning worker onboarding, pay rate configuration, check processing, custom field management, and webhook-based event notifications for HR system integrations.
Install Jentic One Beta
Connect the Paychex External API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Paychex External API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Paychex External API.
Process payroll checks and manage check components for individual workers
Configure worker compensation rates, pay standards, and earning codes
Manage direct deposit accounts and routing for employee payments
Handle federal and local tax configurations for workers
Create and update worker records including contacts and custom fields
Set up webhook notifications for payroll and worker lifecycle events
Retrieve pay period schedules and pay frequency configurations
Use Cases
Patterns agents use Paychex External API for, with concrete tasks.
★ Worker Onboarding Automation
Automate the creation of new worker records in Paychex when employees are hired. The API accepts demographic data, compensation details, tax elections, and direct deposit information in a single flow. This eliminates manual re-entry from an ATS or HRIS and ensures payroll is ready for the next pay cycle without HR intervention.
Create a new worker under company {companyId} with name, address, SSN, pay rate of $75,000 annually, and configure federal tax withholding status as single with 0 allowances
Payroll Check Processing
Submit and manage payroll checks including one-off bonus payments, corrections, and regular pay runs. The API supports creating checks with multiple components such as earnings, deductions, and taxes. Check data can be retrieved for reconciliation with accounting systems after each pay period closes.
Create a payroll check for worker {workerId} with a bonus earning component of $2,500 and verify the check status
Compensation and Tax Configuration
Manage employee pay rates, earning codes, and tax withholding configurations through the API. Supports multiple pay rates per worker, federal and state tax setups, and local tax jurisdictions. Changes take effect on the next applicable pay period, supporting mid-cycle promotions or transfers without manual payroll adjustments.
Update the primary pay rate for worker {workerId} from $70,000 to $80,000 annually effective next pay period and verify the change in compensation records
AI Agent Payroll Integration via Jentic
AI agents connect to the Paychex External API through Jentic to perform payroll operations without managing OAuth token flows or parsing complex response schemas directly. Jentic provides intent-based discovery so agents search for operations like 'add a worker' or 'process a check' and receive the correct endpoint with validated input schemas ready for execution.
Search Jentic for 'retrieve worker pay statements', load the operation schema, and execute it for worker {workerId} for the current year
Key Endpoints
97 endpoints — jentic publishes the only available openapi specification for paychex external api, keeping it validated and agent-ready.
METHOD
PATH
DESCRIPTION
POST
/companies/{companyId}/workers
Create a new worker record
GET
/workers/{workerId}
Retrieve worker details
POST
/workers/{workerId}/checks
Create a payroll check
POST
/workers/{workerId}/compensation/payrates
Add a pay rate
POST
/workers/{workerId}/directdeposits
Configure direct deposit
POST
/auth/oauth/v2/token
Obtain OAuth access token
POST
/management/hooks
Register a webhook subscription
GET
/companies/{companyId}/payperiods
List pay periods
POST
/companies/{companyId}/workers
Create a new worker record
GET
/workers/{workerId}
Retrieve worker details
POST
/workers/{workerId}/checks
Create a payroll check
POST
/workers/{workerId}/compensation/payrates
Add a pay rate
POST
/workers/{workerId}/directdeposits
Configure direct deposit
POST
/auth/oauth/v2/token
Obtain OAuth access token
POST
/management/hooks
Register a webhook subscription
GET
/companies/{companyId}/payperiods
List pay periods
Why Jentic?
Three things that make agents converge on Jentic-routed access.
Credential isolation
Paychex OAuth 2.0 client credentials are stored encrypted in the Jentic vault (MAXsystem). Agents receive scoped bearer tokens — the client ID and secret never enter the agent's context window.
Intent-based discovery
Agents search by intent (e.g., 'process a payroll check') and Jentic returns the matching Paychex operation with its full input schema, so the agent can call the correct endpoint without navigating 97 endpoints manually.
Time to first call
Direct Paychex integration: 3-7 days for OAuth setup, endpoint discovery, and error handling. Through Jentic: under 1 hour — search, load schema, execute.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Paychex External API through Jentic.
Why is there no official OpenAPI spec for Paychex External API?
Paychex does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Paychex External API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.
What authentication does the Paychex External API use?
The Paychex API uses OAuth 2.0 client credentials. You obtain a token by posting your client ID and secret to the /auth/oauth/v2/token endpoint. Through Jentic, OAuth credentials are stored in the MAXsystem vault and agents receive scoped tokens without handling the client secret directly.
Can I process payroll checks with the Paychex External API?
Yes. The POST /workers/{workerId}/checks endpoint creates a payroll check, and POST /checks/{checkId}/checkcomponents adds earning or deduction line items. You can also retrieve check details with GET /workers/{workerId}/checks and delete pending checks with DELETE /checks.
What are the rate limits for the Paychex External API?
Paychex applies per-client rate limiting based on your API subscription tier. The token endpoint has stricter limits than data endpoints. Monitor 429 responses and implement exponential backoff. Jentic handles retry logic automatically when executing operations on your behalf.
How do I add a new employee through the Paychex API via Jentic?
Search Jentic for 'add a worker to company payroll' to find the POST /companies/{companyId}/workers operation. Jentic returns the full input schema including required fields like name, status, and compensation. Execute the operation through Jentic and it handles OAuth token acquisition and request formatting. Install with pip install jentic.
Can I configure direct deposits for workers via the API?
Yes. Use POST /workers/{workerId}/directdeposits to add a new direct deposit account with routing number, account number, and deposit amount or percentage. PATCH /workers/{workerId}/directdeposits/{directDepositId} updates existing accounts, and DELETE removes them.
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