To learn more about Oauth2 and Authentication around REST, the Postman help section gives a good in depth look. It can be found at:

In Flow the connection can either be set up as it's own connector (External Oauth2 provider), or set it up within the Rest-connector itself. This is an example with Flow set up against Salesforce with 5 input parameters (string). The response is captured under the OK response.

If you choose to set up the authentication with the Oauth2-connector it may look like this which is an example of a connection with Microsoft Office 365

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