I followed all the steps. I selected my desired API (YouTube Data API) and created a project. I am searching now for about 20 minutes but I can't find the API Key? My user interface is in german, is it possible that it is named to something else than API Key? Maybe Clientschlüssel (Client Key) ?
This is all I found:
There is also a JSON object, but no API Key:
var myInfos = {
"web":{
"client_id":"censored",
"project_id":"censored",
"auth_uri":"https://accounts.google.com/o/oauth2/auth",
"token_uri":"https://accounts.google.com/o/oauth2/token",
"auth_provider_x509_cert_url":"censored",
"client_secret":"censored",
"redirect_uris":["https://localhost/ex/YouTube/index.html"],
"javascript_origins":["http://localhost"]
}
}