Square Online Self-Serve Ordering
You can setup Self-Serve Ordering in Square so that customers can order on their phone directly from their table. After setting up your Square integration, those orders will sync over to TablesReady, where you can notify them that their order is ready for pickup.
Go to Settings > Checkout > Advanced Settings in your Square account and make sure "Make phone number optional" is not checked; that will ensure phone numbers sync over to TablesReady.
If you want to try out the process from start to finish, you can scan this QR code (or click here), select any products, and check out — no credit card required: