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我正在使用Google API Client Library for Java来获取有关在我的Android应用程序中购买的用户订阅的信息.这就是我现在正在做的事情:

HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
JsonFactory JSON_FACTORY = new JacksonFactory();

GoogleCredential credential = new GoogleCredential.Builder().setTransport(HTTP_TRANSPORT)
                    .setJsonFactory(JSON_FACTORY)
                    .setServiceAccountId(GOOGLE_CLIENT_MAIL)
                    .setServiceAccountScopes("https://www.googleapis.com/auth/androidpublisher")
                    .setServiceAccountPrivateKeyFromP12File(new File(GOOGLE_KEY_FILE_PATH))
                    .build();

Androidpublisher publisher = new Androidpublisher.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).
                    setApplicationName(GOOGLE_PRODUCT_NAME).
                    build();

Androidpublisher.Purchases purchases = publisher.purchases();
Get get = purchases.get("XXXXX", subscriptionId, token);
SubscriptionPurchase subscripcion = get.execute(); //Exception returned here

GOOGLE_CLIENT_MAIL是来自Google控制台的API Access的电子邮件地址. GOOGLE_KEY_FILE_PATH是从API Access下载的p12文件.
GOOGLE_PRODUCT_NAME是品牌信息的产品名称.
在Google APIS控制台中,启用了"Google Play Android Developer API"服务.

我得到的是:

{
  "code" : 401,
  "errors" : [ {
    "domain" : "androidpublisher",
    "message" …