Here you can manage your own API tokens via Single Token or by Oauth. Single user tokens created in this way are non-expiring, and best suited for headless service apps. If you want tokens that are bound to a user and expire, be sure to choose the Oauth option.
- login your Sezzle account, click on Settings -> API Keys
- Click on Create API key
- Copy and paste private and public API keys to your Cart Online Store Sezzle setup page.
- Enabled the integration, you are ready to accept Sezzle payment