Which type of action allows an external application to retrieve data from Power Automate flows?

The correct choice for allowing an external application to retrieve data from Power Automate flows is an HTTP Request. This is because HTTP requests serve as a standardized method to interact with web services. When a flow in Power Automate is set up to respond to an HTTP request, it essentially acts as an endpoint that external applications can make calls to, retrieving or submitting data as needed.

HTTP requests typically utilize methods like GET, POST, PUT, and DELETE, which can be used to perform various actions on the data. In the context of Power Automate, this means that external applications can easily invoke flows through these requests, passing data and receiving responses.

While a Webhook is a way for one application to send real-time data to another, it operates by pushing data rather than allowing for retrieval on demand, which distinguishes it from an HTTP request. A Service Connector would be relevant for integrating with specific services but does not inherently facilitate external applications retrieving data through simple HTTP calls. An API Call is a broader term that encompasses securing and retrieving resources from an API, which involves more than just initiating a flow in Power Automate. Therefore, the most direct and effective method for allowing data retrieval from Power Automate by external applications is the HTTP Request.