Intuit

Financial technology platform powering small business and consumer finance through products like QuickBooks, TurboTax, Mint, Credit Karma, and Mailchimp. The Intuit Developer platform exposes APIs and SDKs so third-party applications can integrate accounting, payments, and tax workflows into their own products.

Trusted by millions of small businesses and individuals worldwide. Intuit stands out by offering a full API surface across its ecosystem: QuickBooks Online API for accounting, OAuth 2.0 for secure access, a GraphQL API in beta for flexible queries, and a global App Store where developers can distribute integrations to QuickBooks users.

Key capabilities:

• QuickBooks Online REST and GraphQL APIs for invoices, customers, vendors, and financial data
• OAuth 2.0 authentication with sandbox environments for testing
• SDKs and sample apps in Node.js, Python, PHP, Java, and .NET
• Webhooks for real-time notifications on entity changes
• Payments API for embedded invoicing and payment collection
• Apps.com marketplace for distributing integrations to QuickBooks users

Developers use the Intuit platform to build accounting sync for eCommerce stores, time-tracking and billing tools, CRM integrations that push deals to invoices, and payment flows that reduce manual reconciliation. The documentation, Postman collections, and multi-language samples support rapid prototyping and production deployments.