Connect Square payments.

When this is done, your website takes card payments through the same Square account as your shop, one place for all your money, one set of reports.

1. Use the Square account you already have. If you take card payments in person, you already have a Square account, and your website can use the same one, so everything lands in one place. If not, sign up free at squareup.com first.
2. Open the Square developer site. Go to developer.squareup.com and sign in with your normal Square login. Click "+" to create an application, name it after your website. This does not change anything about your in-person setup.
3. Switch to Production. At the top of your application page there is a toggle between Sandbox (pretend money, for testing) and Production (real money). Switch it to Production. The most common mistake in this whole manual is copying the Sandbox token, and we will catch it if you do, but save yourself the round trip.
4. Copy your access token and application ID. On the Production side: under "Credentials" copy the Production Access Token (it starts with EAAA) and the Application ID (starts with sq0idp-). Copy each somewhere handy.
5. Paste them into Mission Control. Open your portal → Settings → Connectors → "Connect a service yourself" → Payments (Square). Paste the access token and application ID, press "Check & connect". We verify the token against your real Square account before saving anything, then set it on your hosting and redeploy. The token never appears on screen again.