Maesn's Unified Application Programming Interface (API) lets you integrate the FreeAgent API alongside more than 30 Enterprise Resource Planning (ERP) and accounting systems through one Representational State Transfer (REST) interface. It handles FreeAgent's token limits, pagination and URL-based references automatically, so you ship a production-ready integration in days.

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Benefits of integrating Maesn

Integrating the FreeAgent API directly means handling FreeAgent’s token refresh rate limit of 15 refreshes per minute, link header-based pagination and URL-based resource references from scratch. Maesn’s unified API abstracts all of this, so your team can launch a reliable FreeAgent API integration in days instead of months.

Beyond FreeAgent, the same integration effort gives you immediate access to over 30 other European ERP and accounting systems through one common data model, one authentication flow and one set of webhooks - reducing ongoing maintenance and freeing your engineering team to focus on your core product.

Maesn extends FreeAgent webhook coverage with synthetic webhooks for FreeAgent objects and events, keeping FreeAgent consistent with every other system in your stack. Maesn also supports you through FreeAgent’s marketplace accreditation process, helping you get listed and reach your first live connection faster.

How Maesn works with FreeAgent

Maesn connects to the FreeAgent API and normalises them into a single REST interface built on Maesn’s Common Data Model. You call one consistent set of endpoints with Maesn.

Authentication, token refresh scheduling and FreeAgent’s 15-per-minute refresh cap are managed automatically in the background across all your tenants, so concurrent syncs never fail. Pagination through FreeAgent’s response link headers is parsed for you, and FreeAgent’s URL-based resource references for contacts, accounts and bank accounts are resolved into clean, consistent identifiers.

For anything outside the standard endpoints, Authenticated Passthrough lets you call any endpoint in your user’s authenticated FreeAgent account directly, and Raw Data gives you full, unfiltered responses - so custom FreeAgent setups never block your integration.

How do I get started with Maesn?

You can connect Maesn with FreeAgent by following these steps:

  1. Book a demo with Maesn to scope your FreeAgent API integration.
  2. Get FreeAgent sandbox credentials and explore the docs at docs.maesn.com (opens in new window).
  3. Build your integration using Maesn’s unified REST API, SDKs and quickstarts.
  4. Go live with FreeAgent and get support applying for the FreeAgent marketplace listing.
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