Integrations / Payments, invoicing and accounting

Use AssistCall with QuickBooks Online

AssistCall answers your business calls 24/7 and can send each call, message and booking to QuickBooks Online through Webhook, Zapier, Make, n8n.

QuickBooks Online: QuickBooks Online is Intuit's cloud accounting software that small businesses use for invoicing, payments, expenses and bookkeeping.

Connects

Example call

A client calls at 7pm asking why her invoice went up. AssistCall takes a message with her name, number and reason. A Zap finds her in QuickBooks Online and emails the bookkeeper the message with her customer record, and the owner gets the call summary and recording by email.

• When AssistCall captures a new lead, a Zap runs QuickBooks Online's Find or Create Customer action, so the caller is already on file before the first estimate or invoice.
• When a customer leaves a billing message, a Zap uses Find Customer to pull up their QuickBooks Online record and emails it to the bookkeeper along with the caller's reason and urgency.
• After each call, a Zap uses the Attach File(s) or Note action to attach the call summary to the customer's record in QuickBooks Online.

How it connects

• Webhook: Signed JSON for every call, message and booking, sent to any HTTPS URL you choose.
• Zapier: Send AssistCall events to a Zap (Webhooks by Zapier, Catch Hook), then use the app's Zapier actions. Needs a paid Zapier plan.
• Make: Start a Make scenario with a custom webhook and use the app's Make modules.
• n8n: Start an n8n workflow with a webhook node, then call the app with its node or an HTTP request.
• Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.

About QuickBooks Online's API

• Self-serve API: you can create a key in your account
• Style: REST (JSON), QuickBooks Online Accounting API
• Authentication: OAuth 2.0 only. Access tokens expire after 1 hour. Refresh tokens roll over a 100-day window, capped at 5 years.
• On Zapier: yes. On Make: yes.

Anyone can open an Intuit developer account and create an app. Production keys unlock only after Intuit's app assessment questionnaire, and this applies to private apps too. The API takes only OAuth 2.0 access tokens, which expire after an hour, so AssistCall's live API lookup (which uses one fixed token) can't call QuickBooks directly. In the Intuit App Partner Program, the free Builder tier includes 500,000 CorePlus API calls a month. Webhooks cover entities such as Customer, Invoice and Payment, but only for companies connected to an OAuth app. The practical route is Zapier (29 triggers, 32 actions, 17 searches, including Find or Create Customer and Attach File(s) or Note), Make's QuickBooks app, or n8n's QuickBooks Online node.

Not included: no one-click QuickBooks Online app, no listing in QuickBooks Online's marketplace, no two-way sync, and no partnership with Intuit Inc..

Researched by the AssistCall team and checked against Intuit Inc.'s public pages on October 24, 2026. QuickBooks Online is a trademark of Intuit Inc.. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by Intuit Inc..

More Payments, invoicing and accounting integrations

• PayPal: PayPal is an online payments service that small businesses use to accept payments and send invoices that customers can pay online.
• Square: Square is Block's payments and point-of-sale platform that small businesses use to take card payments, send invoices and keep a customer directory.
• Stripe: Stripe is an online payments platform that businesses use to take card payments, bill customers, run subscriptions and send invoices.
• Authorize.net: Authorize.net is Visa's payment gateway that small businesses use, through a merchant account, to accept card and eCheck payments online, in person and over the phone.
• BILL: BILL is accounts payable, accounts receivable and spend management software that small and midsize businesses use to pay bills, send invoices and get paid.
• FreshBooks: FreshBooks is cloud invoicing and accounting software for freelancers and service-based small businesses, with time tracking, estimates and online payments.

All product and company names in this directory are trademarks or registered trademarks of their respective owners, used only to identify systems AssistCall can send call information to or receive information from. Their use does not imply any affiliation with or endorsement by their owners. AssistCall connects using signed webhooks, the business's own API keys, automation platforms (Zapier, Make, n8n) the business sets up in its own account, and call forwarding. AssistCall does not provide one-click connectors, marketplace apps, certifications or two-way record or calendar sync, and does not sign HIPAA business associate agreements. Vendor features, plans and API access can change; information last checked October 24, 2026.