IntroductionSign-up for a Square Developer Account
Introduction
Testing your configuration and your forms without processing live transactions is an essential and recommended tool in your arsenal when working with payment processing forms. Configuring this in Square is very easy.
Sign-up for a Square Developer Account
Go to the Square Developer Account Sign-in: https://squareup.com/signup?v=developers
Once you』ve configured your account, go to the Developer Dashboard and create a new Application: https://developer.squareup.com/apps
From the New Application Screen, Give your application a name and click Save.
You will be returned to the Developer Dashboard and presented with a list of Sandbox Test Accounts. Select the one you just created and click Launch to open the Seller Sandbox Dashboard.
This will launch this portal (Developer Dashboard): https://squareupsandbox.com/dashboard/
Configure your Sandbox Account in the Square Add-on.