分かる人がいたら教えて下さい

function upload() {
var clientId = '*************';
var imgUrl = 'http://www.google.co.jp/images/srpr/logo11w.png';
var service = getService(); //aouth2のなんか
if (service.hasAccess()) {
var url = 'https://api.imgur.com/3/image';
var response = UrlFetchApp.fetch(url, { //ここでエラーが出る
method: 'post',
headers: {
Authorization: 'Client-ID ' + clientId,
},
data: {
image: imgUrl,
type: 'URL'
}
});
var result = JSON.parse(response.getContentText());
return result;
} else {

こういうエラーが出ます
{"data":{"error":"No image data was sent to the upload api","request":"\/3\/image","method":"POST"},"success":false,"status":400}
どこが間違えてるんでしょうか

imgur apiのページ
https://api.imgur.com/