Authenticate a 3rd party app and use the Token in subsequent API calls

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Hi 

I am trying to connect to a 3rd party. All the APIs are authorized by Bearer token. I want to understand while creating a REST connector what security do I need to select or what steps to take to authorize the APIs.

- I have user name and password which I use to get an auth token from a 3rd party /v1/login API

- This token needs to be used in all the subsequent APIs as authorization token

 

The security config of the REST connector have all the different options like OAUTH2 etc, but all of them require some client credentials and secret.