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You need to login into your PayPal account first.

After login, you'll see the option of Account settings in your profile menu on the top right. Click on that.

This will open up your Account settings. Choose account status from the left-hand side options. In the account access options, you'll see "Log in with Paypal". Click on the button change as shown in the image below.

This will show you a list of all apps that you've granted access to using Paypal. In this find your Clientjoy's test application. Click on the Delete button to disconnect the Clienjoy test app.

Once deleted you'll have to wait for a maximum of 5 to 10 minutes for it to get disconnected in Clientjoy. Once disconnected successfully, you will be able to connect any new account in Clientjoy's Paypal.

You need to login into your PayPal Sandbox account on this URL https://www.sandbox.paypal.com/

After login, you'll see the option of Account settings in your profile menu on the top right. Click on that.

This will open up your Account settings. Choose account status from the left-hand side options. In the account access options, you'll see "Log in with PayPal". Click on the button change as shown in the image below.

This will show you a list of all apps that you've granted access to using PayPal. In this find your Clientjoy's test application. Click on the Delete button to disconnect the Clienjoy test app.

Once deleted you'll have to wait for a maximum of 5 to 10 minutes for it to get disconnected in Clientjoy. Once disconnected successfully, you will be able to connect any new account in Clientjoy's PayPal.