Jason, I had read thro’ the Prerequisites earlier and got stuck in the credentials part. Which credential do I need to use for a stand-alone, command-line Go application (using REST) that wants to access the QPX Express API - the documentation is not clear to me? Ideally an API key should suffice.
You’ll be prompted to select the name of your project. Select it, and press ‘Continue’. On the next page, click the ‘Add Credential’ button. that will open the credential type picker menu. Select ‘API Key’. That is what you need for a locally installed application.
You would select OAuth if your application were going to act on behalf of another user and access data that is private to their Google account. That doesn’t appear to apply in your application.