1- Login to your Chargebee account 2- Go to Settings->Configure Chargebee 3- Scroll down to API Keys and Events and click on API keys 4- Copy Full-Access key 5- In core8 navigate to Configuration->Integrations 6- Click on Chargebee tile 7- Paste your API Key & Site Name. You can get the Site Name from URL e.g. if your URL is https://core8-test.chargebee.com/ then your Site Name is core8-test 8- Turn ON the toggle “Connect to Chargebee Sandbox account” 9- Click on Connect button and your are done