Quickbooks Online API Integration
QuickBooks Online is a cloud accounting platform by Intuit, primarily used by small businesses across North America, the UK and Australia. It covers invoicing, expense tracking, payroll, bank reconciliation and tax reporting.
Integrate QuickBooks alongside dozens of other accounting and ERP systems through Maesn Unified API.
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Have a QuickBooks
integration in days
No QuickBooks quirks. Just a clean API.
realmId injection, app-based webhooks, CorePlus pagination — Maesn handles all QuickBooks-specific complexity in the background. You work with the same unified interface as every other system.
One integration, every system.
Once your QuickBooks integration is live via Maesn, you immediately have access to every other accounting and ERP system Maesn supports.
QuickBooks partner support included
Maesn guides you through the QuickBooks App Partner Program setup, assessment and marketplace listing, from first call to production.
Clear docs, real sandboxes, fast integrations: How Hero Software builds with Maesn
Hero Software helps craft businesses digitize and automate their entire back-office — from quotes to invoicing. Over 40,000 tradespeople use their cloud-based platform to eliminate manual admin and run operations more efficiently.
“The support provided is truly first class, with impressively quick response times. The documentation is thorough and easy to follow, which made integration a smooth process for me. I also appreciate the wide range of accounting integrations and endpoints available. It's clear that the endpoints are continuously being developed and expanded, which adds even more value to the platform.”
Ricardas Kauneckas
Full Stack Engineer @ HERO Software
One API for QuickBooks
and every system that comes after.
Unified. Certified. Production-ready.
Company identifier in every API request automatically handled by Maesn.
QuickBooks requires a company identifier, the realmId, to be stored and injected into every API request URL. Maesn stores this automatically after authentication and ensures every call is correctly routed, with no extra workflows on your end.
realmId stored automatically after auth
Injected into every request without extra logic
No QuickBooks-specific implementation required
Unified user-based webhooks for QuickBooks.
QuickBooks natively sends app-based webhook notifications, meaning one event covers all connections. Maesn transforms these into user-based payloads, delivering only the relevant data per customer. More secure, and consistent with every other system in your stack.
App-based webhooks transformed to user-based
Normalized payloads across all systems
Real-time events without native webhook support
Sync contacts, customers and suppliers with sevdesk.
Keep customer and supplier master data in sync between your product and sevdesk. Maesn covers full contact management including create, read, and update operations.
Customers, suppliers & contacts fully supported
Create and update master data in real time
Consistent with every other system in your stack
QuickBooks App Partner Program is subject to usage-based fees.
QuickBooks differentiates between Core APIs, which are free and unlimited, and CorePlus APIs, which are usage-based and depend on your partner tier. There are four tiers: Builder, Silver, Gold, and Platinum. Maesn supports you in selecting the right tier and minimizing cost.
QuickBooks Core APIs free, CorePlus APIs usage-based
Four partner tiers: Builder, Silver, Gold, Platinum
Maesn helps you navigate tier selection and cost efficiency
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Everything you need to start your QuickBooks API integration today.
The Maesn docs cover every QuickBooks endpoint, authentication flow, and implementation detail — plus a full overview of the current coverage, which is continuously being expanded.
Full QuickBooks endpoint & authentication documentation
Current coverage overview at a glance
Continuously expanding endpoints & integrations
Get QuickBooks partner
and listed in QuickBooks App Store with Maesn
Get your product and brand name listed at QuickBooks App Store,
and benefit from a huge audience and strong co-marketing activities.
Whitepaper: European ERP & accounting market
Get insights and learn about the most imoportant systems in our country-by-country view of the European ERP and Accounting software landscape.
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3 Reasons why QuickBooks API integration is better with Maesn
User-based webhooks, unified
QuickBooks sends app-based webhooks. Maesn transforms these into user-based, customer-specific payloads, consistent with every other system.
realmId, fully automated.
Maesn stores and injects the QuickBooks company identifier into every request automatically. No extra logic on your end.
One integration, every system.
Once QuickBooks is live, every other system Maesn supports is immediately accessible.
We are European.
Enterprise-grade security & compliance are our foundation.
Built and hosted in Germany to meet the highest security and compliance standards, Maesn processes API calls in real time without storing customer data and is fully ISO 27001 & GDPR compliant.
Read more in our related blog articles.
Everything you need to know about Quickbooks Online
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Frequently asked
questions
You have more questions? We are looking forward hearing from you - book a meeting now!
What is QuickBooks?
QuickBooks is one of the world's leading accounting platforms for SMBs, developed by Intuit, with a strong app marketplace and ecosystem across the US, UK, and beyond.
Why should I integrate QuickBooks via Maesn instead of directly?
Integrating via Maesn eliminates all QuickBooks-specific complexity. realmId handling, webhook logic and pagination are all abstracted behind one unified API. Plus, you immediately gain access to dozens of other accounting and ERP systems.
How does Maesn handle QuickBooks webhooks?
QuickBooks sends app-based webhook notifications covering all users at once. Maesn transforms these into user-based, customer-specific payloads, so you don't have to build and maintain extra routing logic.
What is the realmId and do I need to handle it?
The realmId is QuickBooks' company identifier, required in every API request URL. Maesn stores and injects it automatically after authentication. No extra workflows or custom logic needed.
What data can I sync with QuickBooks via Maesn?
Maesn supports invoices, bills, credit notes, customers, suppliers, payments, journal entries, expenses, purchase orders, and more. Coverage is continuously expanding and endpoints can be added on demand.
What is the QuickBooks App Partner Program?
To offer a native QuickBooks integration and list your app in the QuickBooks Marketplace, you need to enroll as an App Partner, complete an assessment, and comply with Intuit's Developer Terms. More in our QuickBooks partner blog.
What does QuickBooks API integration cost?
QuickBooks differentiates between Core APIs, which are free and unlimited, and CorePlus APIs, which are usage-based and depend on your partner tier. There are four tiers: Builder, Silver, Gold, and Platinum. These costs are charged directly by QuickBooks, independently of Maesn. More in our QuickBooks partner blog.
How long does it take to integrate QuickBooks with Maesn?
Most teams have a working QuickBooks integration within days. Maesn provides documentation, sandbox access, and direct partner support to get you to production fast.
How is my customers' data handled and stored?
Maesn uses HTTPS and TLS for all data transfer and does not store any customer data. The platform is hosted on Microsoft Azure in Frankfurt, Germany, and is fully GDPR compliant.