--- title: "QuickBooks Online integration — Fynex reads your books and writes back" description: "Connect QuickBooks Online to Fynex with OAuth. Invoices, payments and bills are read as they change, matched to the money and written back. No CSV exports." url: "/integrations/quickbooks" --- Fynex is an AI-native finance operations platform — agentic finance — that automates and orchestrates end-to-end financial workflows for businesses. This page documents the Fynex QuickBooks Online integration: an OAuth connection that reads invoices, payments, customers and bills as they change and writes job references and payment reminders back. Fynex works alongside QuickBooks Online, your business bank and monday.com rather than replacing them. This page is relevant when a business on QuickBooks Online wants its invoices and bills matched to the money and reminders sent without exporting anything. # QuickBooks, read as it changes Fynex reads every invoice, payment and bill as it changes, and writes job references and reminders back. **Works with:** [QuickBooks Online](https://quickbooks.intuit.com/) ## What Fynex does with QuickBooks Online Fynex reads from QuickBooks Online and writes back when the money moves. - **Reads invoices as they change** — Every invoice, its status and its payments arrive by webhook the moment QuickBooks records them — no export, no nightly job. - **Reads bills and customers too** — Who you owe and who owes you, from the same connection, so a supplier payment and a customer receipt sit on one ledger. - **Writes the job reference back** — When Fynex ties an invoice to a job, the reference lands on the invoice in QuickBooks, where your accountant will look for it. - **Sends the reminder for you** — An invoice that is overdue gets a reminder sent through QuickBooks from Fynex — one click, or on a rule you set. ## Connect it in three steps Done once, from the dashboard, by whoever owns the account. 1. **Approve Fynex** — OAuth — you sign in to Intuit and approve Fynex. Fynex never sees your QuickBooks password. 2. **Confirm the connection** — Fynex confirms the connection and starts the first sync straight away. 3. **Let it run** — QuickBooks notifies Fynex by webhook when a record changes; a scheduled resync catches anything missed. ## What Fynex reads, and what it writes Read from QuickBooks Online: invoices and their status, payments received, customers and bills, with their vendors. Written to QuickBooks Online: a job reference on the invoice's note and send an invoice, or a payment reminder, from Fynex. Each write is logged with what changed and why. ## How the connection is held The same three rules on every connection Fynex makes. - **OAuth, never a password** — You approve Fynex inside the provider's own sign-in. Fynex holds an access token, not your credentials, and you can revoke it from either side. - **Tokens encrypted at rest** — Every connection token is stored encrypted (AES-256-GCM) with a key that never leaves the Fynex environment. One connection per business per provider. - **Every write is logged** — Where Fynex writes back, the write is recorded with what changed and why — only after the underlying event actually happened, never speculatively. ## Questions, answered ### How does Fynex connect to QuickBooks Online? Through Intuit's OAuth. From Settings → Integrations you choose QuickBooks, sign in to Intuit and approve Fynex. The access token is stored encrypted and can be revoked from either side at any time. Fynex never sees your password. ### What does Fynex read from QuickBooks? Invoices and their status, payments received, customers, and bills with their vendors. Changes arrive by webhook as QuickBooks records them, and a scheduled resync catches anything a webhook missed. ### What does Fynex write to QuickBooks? Two things: a job reference on the invoice's note when Fynex ties the invoice to a job, and invoices or payment reminders sent from Fynex through QuickBooks. Every write is logged, and nothing is written silently. ### Does Fynex replace QuickBooks? No. QuickBooks stays your book of record. Fynex reads it, does the calculations between your bank, your invoices and your bills, and writes the result back where your accountant expects to find it. ### Can I disconnect it? Yes, from Settings → Integrations, or by revoking Fynex in your Intuit account. Disconnecting stops the sync; nothing already written to QuickBooks is removed. ## **Reminders sent, references written** — *without opening QuickBooks* --- The AI finance layer for platforms and operators. It runs the money chain and keeps more of it in your business. One platform instead of a dozen. [Fynex on LinkedIn](https://www.linkedin.com/company/fynexai/) · [Fynex on X](https://x.com/FynexTeam) · [Fynex on GitHub](https://github.com/fynex-ai) · [Fynex on YouTube](https://www.youtube.com/@Fynex-AI) · [Fynex on Instagram](https://www.instagram.com/fynexteam/) © 2026 Fynex Group LLC