Integrations are channels providers which you can use to send notifications.
To get started with a provider, all it takes is to add your provider keys to Raven. This removes any effort needed to integrate or manage provider APIs and also allows you to switch anytime to a different provider.
Head over to the Integrations tab where you will see list of available providers (for every channel). Select a provider and add its keys to make it live.
Our channel wise Integration doc will help you add your provider.
Your Integration keys are encrypted and stored securely. Check our security doc for more details on how we store them.