0n3
MCP servers · QuickBooks · connector · GPT action

Connect ChatGPT to QuickBooks

One line gives ChatGPT your QuickBooks account as tools: 21 endpoints, invoices, customers, payments, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.

Get the line for ChatGPTConnect QuickBooks first

Three steps

  1. Create a free 0n3 account and connect QuickBooks. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
  3. Ask ChatGPT: whoami. Then: "Create an invoice in QuickBooks".
Custom connector (needs Developer mode)
  1. Settings → Connectors (or Apps) → Advanced → Developer mode on
  2. Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
  3. Finish the sign-in with your 0n account
  4. Enable the connector in a chat and ask: "whoami"

ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).

The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.

What ChatGPT can then do in QuickBooks

Invoices · Create and send invoices4
Create an invoicePOST /company/{realmId}/invoice
List invoicesGET /company/{realmId}/query
Get an invoiceGET /company/{realmId}/invoice/{invoiceId}
Send an invoicePOST /company/{realmId}/invoice/{invoiceId}/send
Customers · Manage customers4
Create a customerPOST /company/{realmId}/customer
List customersGET /company/{realmId}/query
Get a customerGET /company/{realmId}/customer/{customerId}
Update a customerPOST /company/{realmId}/customer
Payments · Record and list payments2
Create a paymentPOST /company/{realmId}/payment
List paymentsGET /company/{realmId}/query
Accounts · Chart of accounts management2
List accountsGET /company/{realmId}/query
Get an accountGET /company/{realmId}/account/{accountId}
Bills · Create and track bills2
Create a billPOST /company/{realmId}/bill
List billsGET /company/{realmId}/query
Estimates · Create and send estimates2
Create an estimatePOST /company/{realmId}/estimate
Send an estimatePOST /company/{realmId}/estimate/{estimateId}/send

All 21 QuickBooks endpoints →

QuickBooks in other AI clients

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ChatGPT with other apps

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