QuickBooks Online API
QuickBooks Online API (by Intuit) provides programmatic access to the most widely used small-business accounting platform in the US. Enables management of invoices, customers, vendors, expenses, payroll, bank feeds, and financial reports.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Intuit QuickBooks API. OAuth2 with financial data scopes. Highly sensitive accounting data — restrict access strictly. Tokens expire hourly. Never expose refresh tokens.
⚡ Reliability
Best When
An agent needs to automate accounting tasks for a US small business already using QuickBooks Online.
Avoid When
The business uses Xero, Sage, or other accounting software, or when enterprise-scale accounting features are required.
Use Cases
- • Automated invoice creation and accounts receivable management
- • Expense categorization and bill payment automation
- • Customer and vendor record synchronization
- • Financial report generation (P&L, balance sheet, cash flow)
- • Payroll data access and automation
- • Bank transaction import and reconciliation
Not For
- • Enterprise ERP (QuickBooks targets small to mid-market businesses)
- • Non-US accounting practices without proper localization
- • Real-time payment processing (separate Intuit Payments API)
Interface
Authentication
OAuth2 with authorization code flow. Scopes: com.intuit.quickbooks.accounting and com.intuit.quickbooks.payment. Access tokens expire after 1 hour; refresh tokens valid for 100 days. realmId (company ID) required on every API call, similar to Xero's tenantId pattern.
Pricing
30-day free trial. Third-party apps built on the API require the merchant to have an active QuickBooks subscription. Intuit has a formal app marketplace with approval process for public apps.
Agent Metadata
Known Gotchas
- ⚠ realmId (company ID) required on every API call — must be captured and stored during OAuth flow
- ⚠ Access tokens expire after 1 hour — shorter than most APIs; agents need aggressive token refresh logic
- ⚠ Minor vs major entity distinction affects rate limits — agents hammering Invoice endpoints hit limits faster
- ⚠ Query Language (IDS Query) is SQL-like but not standard SQL — requires learning QBO-specific syntax
- ⚠ Sparse update vs full update distinction: PATCH-like updates require SyncToken for optimistic locking
- ⚠ SyncToken must be current on every update — stale SyncToken causes 400 errors; agents must re-fetch before updating
- ⚠ App must go through Intuit's app review for production OAuth — sandbox apps cannot exceed 25 test users
- ⚠ Webhook subscriptions require HTTPS endpoint verification and support limited event types
Alternatives
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Scores are editorial opinions as of 2026-03-07.