External API Pipeline Webhook Request Authentication credentials not provided

Hi,

This will be the first time I am hoping to call an external API.  So far here is my pipeline but I am running into an authorization credentials not provided.

Here is the documentation but I am unable to figure it out:

And an example below:

Here is the error the pipeline is giving me:

how do I provide the authentication credentials?  Any help would be incredibly appreciated.  Thank you so much!