Im set Youtube API KEY [closed]

I'm look for Youtube API Key

https://www.googleapis.com/youtube/v3/channels?part=statistics&id=UCezJOfu7OtqGzd5xrP3q6WA&key=XXXXXXXXXXXXXXXXXXXXXXX

result below

{"error": {"code": 403,"message": "The request cannot be completed because you have exceeded your \u003ca href="/youtube/v3/getting-started#quota"\u003equota\u003c/a\u003e.","errors": [{"message": "The request cannot be completed because you have exceeded your \u003ca href="/youtube/v3/getting-started#quota"\u003equota\u003c/a\u003e.","domain": "youtube.quota","reason": "quotaExceeded"}]}}

but,

Youtube Test Page Result OK

enter image description here

how to setting API Key?