I'm trying to use youtube api to get a list of subscribers to a channel i own then check a user's Email to find out if he's subscribed or not. Now I'm using this page to test my first step https://developers.google.com/youtube/v3/docs/subscriptions/list and inserting data as follows and all other fields are empty
As you can see I get this error and the part label contains an error while the value is "snippet". how to solve this problem and if solved as I need is it available to get a list of all users' emails subscribed to my channel as a list?