10 min call in english - AWS explain me how to make alexa AWS news feed Skill for echo (AWS-Lambda, AWS-Api-Gateway)

I want to know how to make amazon alexa news feed skill. - I already created a api endpoint that returns json with API-Gateway and lambda: [login to view URL] - I used this sctructure: [login to view URL] - But even if I change the uiid when i ask my echo dot he says there are no new news in my news feed. If i have error in lambda it says skill is not available so somehow a connection is already established i think a 10 min phone call to clarify my probably simple problem would be enough second part we can do then is to reference a mp3 file on s3 with this news feed skill