Create and Authorize a Sandbox Test Account
Create Sandbox test accounts and access the Sandbox Seller Dashboard in the Developer Dashboard.
Sign in to the Developer Dashboard to create test accounts.
The Developer Dashboard lets you create up to four test accounts in addition to the default Sandbox test account.
Choose Add to create a new Sandbox test account.
The application OAuth page lets you authorize a Sandbox test account to use your application with the permission scope you set in the authorization. In testing, you can bypass the production OAuth Authorization API callflow by using the access token generated for each Sandbox test account you create.
Sign in to the Developer Dashboard and choose the application that you want a test account to be authorized to use.
On the application page, you can toggle between the Sandbox and Production accounts. Choose Sandbox.
Open the OAuth page, and then choose Authorize an Account.
In the Authorize an Account dialog box, choose a Sandbox test account to authorize.
Choose the permissions that you want the account to have, and then choose Save.
If you want to change the permission scope that you authorized for a Sandbox test account, you must revoke the existing authorization and then create a new one.
Use your Sandbox test account to test a Square Payments website integration. For more information, see Walkthrough: Integrate Square Payments in a Website.