Go to back office > Dashboard > Payment methods > New > select Squareup payment from the Payment Method drop down > Name your payment method through the Title field and hit Save. You will be redirected to the second tab Payment Configuration where you have to select Sandbox (test): No and enter your Application ID (Production) and Access token (Production) which you have to get from your Square merchant dashboard. Set up the additional payment method fields to match your preferences and click Save and Close. The payment method will automatically appear at The Booking Form so your customers can chose it before checkout.