我已经尝试了几次，但我无法在Google People API v1中使用谷歌Playground工具。

Request / Response
POST /oauth2/v4/token HTTP/1.1
Host: www.googleapis.com
Content-length: 278
content-type: application/x-www-form-urlencoded
user-agent: google-oauth-playground
code=4%2FhQlhA-MiWKhcmHWVUddb8TmiaVEDdMd_3lDHid9eYBc&redirect_uri=https%3A%2F%2Fdevelopers.google.com%2Foauthplayground&client_id=111243977462-pc15rhq33ojuc7i54ce3qd8upj6mtnc3.apps.googleusercontent.com&client_secret=ozWubBNz1iKdykitcK757UOo&scope=&grant_type=authorization_code
HTTP/1.1 401 Unauthorized
Content-length: 74
X-xss-protection: 1; mode=block
X-content-type-options: nosniff
Transfer-encoding: chunked
Expires: Sun, 16 Jul 2017 14:54:42 GMT
Vary: Origin, X-Origin
Server: GSE
-content-encoding: gzip
Cache-control: private, max-age=0
Date: Sun, 16 Jul 2017 14:54:42 GMT
X-frame-options: SAMEORIGIN
Alt-svc: quic=":443"; ma=2592000; v="39,38,37,36,35"
Content-type: application/json; charset=UTF-8
Www-authenticate: Bearer realm="https://accounts.google.com/"
{
  "error_description": "Unauthorized", 
  "error": "unauthorized_client"
}

我已经遵循了下面的建议：

1. Delete the whitespace in the 'OAuth Client ID' and 'OAuth Client secret' in the OAuth 2.0 configuration of Google PlayGround
2. Define in the manager API the authorized redirection URI for: https://developers.google.com/oauthplayground
3. Verify in the Manager API is enabled on the Dashboard

有没有人能帮我提供更多解决这个问题的小贴士？

以下是我在谷歌Playground上所做的描述：

Step 1 Select & authorize APIs
1. I select Google API v1 and framework https://www.googleapis.com/auth/contacts.readonly
2. Click the 'Authorize APIs'

Step 2 Exchange authorization code for tokens
1. Click the 'Oauth 2.0 Configuration'
2. Click on the 'Use your own OAuth credentials'
3. Enter the 'OAuth Client ID' and the 'OAuth Client secret'
4. Click the button: 'Exchange authorization code for tokens'

我不知道这是否与这个问题有关，但我注意到连接到我的帐户的应用程序列表没有显示为OAuth 2.0 Playround。但我有一个‘Google API Explorer’，在那里我成功地测试了对我的联系人的访问(Google People API)。