You can manually grant permission to Cartloom to access specific information in your PayPal account and perform PayPal API operations on your behalf.
To grant permissions to a Cartloom:
Log in to PayPal with your Personal or Business account. If you do not have an account, create one.
Click Profile at the top right, and select Profile and Settings.
In the left menu, click My selling tools.
In the Selling online section, click Update next to API access.
On the API Access page, click Grant API Permission.
Enter the name of the user to whom you will grant permissions. The Cartloom name to use is paypal_api1.cartloom.com
On the Add New Third Party Permissions page, select the types (shown below) of permissions you want to grant to the third party and click Add.