--- title: FreshBooks API Integration on Truto slug: freshbooks category: Accounting canonical: "https://truto.one/integrations/detail/freshbooks/" --- # FreshBooks API Integration on Truto **Category:** Accounting **Status:** Generally available ## How it works 1. **Link your customer's FreshBooks account.** Use Truto's frontend SDK; we handle every OAuth and API key flow so you don't need to create the OAuth app. 2. **Authentication is automatic.** Truto refreshes tokens, stores credentials securely, and injects them into every API request. 3. **Call Truto's API to reach FreshBooks.** The Proxy API is a 1-to-1 mapping of the FreshBooks API. 4. **Get a unified response format.** Every response uses a single shape, with cursor-based pagination and data in the `result` field. ## Use cases - **Automate invoice creation from job completion workflows** — Field service, project management, or freelancer platforms can automatically generate and send FreshBooks invoices when work is marked complete, eliminating manual data entry for their small-business users. - **Sync billable time entries into FreshBooks for end-of-month invoicing** — Time tracking and project management SaaS products can push logged hours directly into FreshBooks as billable time entries, so service-based users see accurate draft invoices without re-entering data. - **Push categorized expenses and receipts into FreshBooks automatically** — Expense management and corporate card platforms can create FreshBooks expenses with attached receipt images, giving consultants and freelancers clean books without manual uploads. - **Trigger downstream workflows from FreshBooks payment events** — CRMs and client management tools can listen for FreshBooks payment webhooks to automatically update deal stages, unlock onboarding flows, or notify account managers when invoices are paid. - **Keep client records in sync between your platform and FreshBooks** — Any SaaS product that manages customer or client data can bidirectionally sync contacts with FreshBooks, ensuring invoices always go to the right person with the right details. ## What you can build - **One-click invoice generation from closed deals** — Automatically create a FreshBooks client and draft invoice with line items when a deal is marked won in your platform. - **Billable hours push to FreshBooks projects** — Sync time entries logged in your app directly to FreshBooks projects as billable time, tagged to the correct client and service. - **Real-time payment status updates via webhooks** — Subscribe to FreshBooks payment.create events to instantly reflect invoice payment status inside your product's UI. - **Expense creation with receipt attachment** — Push expenses into FreshBooks with categorized vendor data and digitally attached receipt images using the two-step upload flow. - **Client and contact directory sync** — Keep your platform's customer list in sync with FreshBooks clients so users never have to manually reconcile contact information across systems. - **Estimate-to-invoice lifecycle tracking** — Create FreshBooks estimates from your quoting workflow and track their conversion into invoices without leaving your product. ## FAQs ### What authentication method does FreshBooks use? FreshBooks uses OAuth 2.0 for authentication. Truto handles the full OAuth flow, token refresh, and credential storage so your team doesn't need to build or maintain auth infrastructure. ### Is this integration available out of the box on Truto? FreshBooks is available as a built-on-request integration. Truto can build and ship the connector based on your specific use case, covering the API endpoints, auth handling, and data models you need. ### How does the FreshBooks API handle different data domains? The FreshBooks API is split across multiple base paths. User identity and team data live under /auth/api/v1/, while core accounting objects (invoices, expenses, clients, time entries) live under /accounting/account/{accountId}/. Truto abstracts this fragmentation so you work with a consistent interface. ### Does FreshBooks support webhooks for real-time data? Yes. FreshBooks supports webhooks for key events like invoice.create, payment.create, and others. This enables real-time reactions in your product without polling, such as updating deal statuses when payments land. ### Are there any quirks with file uploads in the FreshBooks API? Yes. Attaching a receipt or image is a two-step process: you first POST the file to a /uploads endpoint to receive a JWT token, then pass that JWT in the payload of the subsequent expense or invoice creation call. Truto can handle this workflow for you. ### What OAuth scopes are required for common operations? FreshBooks enforces granular OAuth scopes. Standard accounting operations use typical scopes, but managing team members or certain business-level settings requires the admin:all:legacy scope. Truto configures the correct scopes based on the data your integration needs to access. ## Related reading - [How to Integrate with the FreshBooks API (2026 Engineering Guide)](https://truto.one/blog/how-to-integrate-with-the-freshbooks-api-2026-engineering-guide/) — A technical deep-dive into FreshBooks API integration: 12-hour OAuth tokens with single-use rotation, silent pagination caps, webhook verification, and the build-vs-buy decision.