Send an email in Postmark when a new booking in Square

What each client fills in

Postmark: From

For example Northside Plumbing <hello@northside.example>

Who it goes to (Postmark)

The address that gets it: yours, or the client’s team.

The accounts it needs

Each is the client’s own, stored encrypted and never copied between clients. Until one is added the client’s checklist shows it, and nothing runs.

• Square

  developer.squareup.com → the client’s application (their own account) → Credentials → Production access token. A personal access token for the client’s own account needs no Square review.

• 

  Postmark → the client’s server → API Tokens → copy the Server API token. The From address must be a confirmed sender signature or on a verified domain.

After you install it

It lands switched off. The client’s checklist holds exactly this:

1. Connect the client’s Square, for “A new booking”
2. Connect the client’s Postmark, for “Send an email”
3. Fill in Postmark: From (For example Northside Plumbing <hello@northside.example>)
4. Fill in Who it goes to (Postmark) (The address that gets it: yours, or the client’s team)
5. Confirm with the client: The client is on Square Appointments Plus or Premium. On the free Appointments plan, bookings made in Square’s own dashboard or booking site send no event: only bookings made through the API do.