API Connections allows developers to connect Logic Apps or Azure Functions to a wide range of SaaS providers. It deals with the complexity involved with managing authentication and authorization to those providers, so developers can focus on their business logic instead.

• Single place to manage all your API connections – Several apps can share connections, preventing developers from authenticating multiple times for each app. Those connections can all be viewed and managed in single place, which allows better naming them, updating credentials or removing them from the system.
• Automatic refreshing – Each API Connection created in Logic Apps or Azure Functions has built-in logic to refresh credentials when needed. Developers using those connections don’t have to worry about implementing refresh logic for each SaaS provider.
• Configure once, run multiple times - When configuring access to a SaaS provider the API Connection settings are stored with an authorization token, issued by the provider, that allows your logic app or Azure function to run multiple times without needing reconfiguration.