Applications Links allows you to configure 'impersonating' and 'non-impersonating' authentication types:

• Impersonating authentication types make requests on behalf of the user who is currently logged in. People will see only the information that they have permission to see. This includes OAuth and Trusted Applications authentication.
• Non-impersonating authentication types always use a pre-configured user when making a request. Everyone logged into the system will see the same information. This includes basic HTTP authentication.