Penfold Partner API

Penfold Partner API
4.0

Add MCP server to your AI tool

Allow AI tools and LLMs to interact with the API documentation portal through MCP.

MCP server URL

https://docs.getpenfold.dev/mcp

Standard setup for AI tools providing an mcp.json file

mcp.json 
"Penfold Partner API MCP server": {
  "url": "https://docs.getpenfold.dev/mcp"
}
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Base URL 
https://partner-api.getpenfold.dev/v4

Unified API for payroll partners to onboard employers, manage employees, contributions, and file uploads.

Authentication

OAuth2 client credentials via Azure AD B2C.

  1. POST to the Azure AD B2C token endpoint with grant_type=client_credentials and the configured scope.
  2. Include the access token as a Bearer token in the Authorization header.

The token's client_id is mapped to your organisation, which scopes all requests to your employers only.

Identifier conventions

  • Employer ID (id): UUID assigned by Penfold when the employer is created. Used as the {employerId} path parameter.
  • External reference (externalReference): The Penfold employer reference (e.g. PEN12345678). This is PEN + the Companies House number. Returned alongside id in employer responses for cross-referencing.
  • Employee ID: Unique identifier assigned by Penfold when the employee is enrolled.

This is version 4.0 of this API documentation. Last update on May 12, 2026.