Enable Appointments for FINESSE Onboarding Sandbox

Questions
1

Hello Square Developer Support,

Please enable Appointments for our isolated US test business, FINESSE Onboarding Sandbox, or provide a supported Sandbox onboarding path. We are testing LineUP merchant onboarding and booking.

On November 9, 2026 at 15:34:42 UTC, normal OAuth token exchange and GET /v2/locations returned HTTP 200. GET /v2/bookings/location-booking-profiles returned HTTP 401: AUTHENTICATION_ERROR / UNAUTHORIZED / Merchant not onboarded to Appointments.

The authenticated Sandbox dashboard has no Appointments entry. Add more opens no setup screen. The documented Sandbox Appointments link redirects to production marketing.

Can Square provision Appointments for this existing Sandbox seller, or provide a supported pre-onboarded Sandbox test seller? We need to test onboarding, availability and bookings without activating a production business.

We can provide the application ID, merchant ID and trace ID privately through a Square-approved channel. Please preserve existing test businesses and all production accounts. We are not requesting production activation, payments or customer messaging.

Thank you,
Idan Harel

3

Please provide your ID’s privately and I will be able to start the process

Thank you

4

(post deleted by author)

5

Hi Helner, thanks for your help. Your profile appears to be hidden and I don’t see an option to send you a private message. Could you message me privately or let me know the best way to share the IDs securely? Thank you, Idan