Integrations / Payments, invoicing and accounting

Use AssistCall with Invoice2go

AssistCall answers your business calls 24/7 and can send each call, message and booking to Invoice2go through Webhook, Zapier.

Invoice2go: Invoice2go is a mobile invoicing and estimates app, owned by BILL, that tradespeople and other very small businesses use to bill customers and get paid from their phones.

Connects

Example call

A homeowner calls a handyman about a leaking faucet while he's on another job. AssistCall takes her name, number, address and the problem, and a Zap adds her as a client in Invoice2go. He sends the estimate from the app that evening.

• When AssistCall captures a new lead, a Zap uses Invoice2go's Create Client action, so the caller is ready for an estimate in the app.
• Forward your mobile number to AssistCall when you're on a job, and get each call's summary, transcript and recording by email.
• AssistCall takes the caller's job details and address in a message, so you can write the Invoice2go estimate straight from the summary.

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.
• Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.

About Invoice2go's API

• No public API
• Style: No public API documented
• Authentication: Not applicable (no self-serve API keys)
• On Zapier: yes. On Make: no.

Invoice2go doesn't publish a self-serve developer API, and sources disagree on whether a partner-only API still exists. Its Zapier app has two actions, Create Client and Create Item, and no triggers or searches. We found no Make app.

Not included: no one-click Invoice2go app, no listing in Invoice2go's marketplace, no two-way sync, and no partnership with BILL Holdings, Inc..

Researched by the AssistCall team and checked against BILL Holdings, Inc.'s public pages on October 24, 2026. Invoice2go is a trademark of BILL Holdings, Inc.. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by BILL Holdings, 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.
• QuickBooks Online: QuickBooks Online is Intuit's cloud accounting software that small businesses use for invoicing, payments, expenses and bookkeeping.
• 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.

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.