Connect to API by web connect

Dears,

I need help, I'm trying to connect to my API but unfortunately, I can't, I have my header and my token but when I add it request a key and when I added the key it says that. " A web API key can only be specified when a web API Key name is provided. 

I tried to use advanced and add the URL then in the HTTP request header parameter I type the Authorization because it should be added to each request even that it is not working. 

One more question how can I specify the Get or it should be in a power query, and if you can share with me any sample of that. 

Thank you so much.