Follow the steps below to get the Access token of Square.
Step 1: Sign in to the Square Developer Portal => https://developer.squareup.com/apps using your Square credentials.
Step 2: Click the + button to create an application (in the dialog box icons, select the options you want).
Step 3: If you were not automatically redirected to the settings page, click the Open button (see image above). On the settings page, note if Sandbox or Production is selected.
Step 4: Scroll down and find the Sandbox/Production Access token and click the Show button to show the token itself.
Step 5: Copy the token and paste it into the appropriate field on the MigrationPro connection page. Then click the "Check connection" button to establish the connection.
*Remember, our support team is available to assist you should you encounter any difficulties during this process. Happy migrating!