Use AssistCall with Square Appointments

AssistCall answers your business calls 24/7 and can send each call, message and booking to Square Appointments through Webhook, Live API actions, Zapier, Make, n8n.

Square Appointments: Square's booking and payments app for appointment businesses such as salons, barbershops, spas and wellness studios.

Connects

Example call

A regular calls to book a cut with Marco on Friday. The receptionist finds her in Square by phone number, checks Marco's open times, and books 4pm. The shop sees the appointment in Square Appointments, and the owner gets the call summary by email.

During a call, the receptionist searches Square's customer directory by the caller's phone number and greets returning clients by name.
The receptionist searches Square availability for the requested service and staff member, then creates the booking while the caller is on the line (needs Appointments Plus or Premium).
After each call, Zapier's Square Create Customer action adds new callers to Square, so they're on file before their first visit.

How it connects

Webhook: Signed JSON for every call, message and booking, sent to any HTTPS URL you choose.
Live API actions: During the call, the receptionist calls the app's API with your key to look up or create records.
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 Square Appointments's API

Self-serve API: you can create a key in your account
Style: REST (Square Bookings, Customers APIs)
Authentication: Personal access token for your own account, or OAuth 2.0
On Zapier: yes. On Make: yes.

A personal access token from the Square Developer Console works in production for your own Square account. Creating, updating or canceling the business's bookings through the API needs an Appointments Plus or Premium subscription, and without it those calls return a 403 error. Free-plan sellers can still read bookings. Booking changes are sent as booking.created and booking.updated webhooks.

Not included: no one-click Square Appointments app, no listing in Square Appointments's marketplace, no two-way sync, and no partnership with Block, Inc. (Square).

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

More Calendars and scheduling integrations

Calendly: Online scheduling links that let clients pick an open time on your calendar, used by consultants, coaches, sales teams and service businesses.
Google Calendar: Google's online calendar, included with Gmail and Google Workspace, which many small businesses use to track appointments, jobs and staff schedules.
Microsoft Outlook Calendar: The calendar in Outlook and Microsoft 365, used by offices that run their email, meetings and scheduling on Microsoft 365.
Acuity Scheduling: Online appointment scheduling from Squarespace with intake forms, packages and payments, used by solo practitioners and small service teams.
Cal.com: Open-source scheduling links and booking pages, hosted or self-hosted, used by consultants, agencies and software teams.
Microsoft Bookings: Microsoft 365's booking pages and shared appointment calendar for teams, connected to Outlook and Teams.

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.