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我正在尝试使用 Paypal 设置登录,但我收到一条未经授权的消息 ("{\"error_description\":\"Unable to generate token\",\"error\":\"access_denied\"}")在获取访问令牌时(我收到了授权码而没有打嗝)。我认为我可能错的唯一一件事是这项服务对非美国居民的可用性。它说非美国居民无法使用 REST API,但我注意到它与“使用 Paypal 登录”是分开的。有人知道吗?

这是我正在使用的代码来检索访问令牌,以防任何人注意到错误:

        string TokenEndpoint = "https://api.paypal.com/v1/identity/openidconnect/tokenservice"; 
        System.Collections.Specialized.NameValueCollection reqparm = new System.Collections.Specialized.NameValueCollection();

        reqparm.Add("client_id", this._clientId);
        reqparm.Add("client_secret", this._clientSecret);
        reqparm.Add("grant_type", "authorization_code");
        reqparm.Add("code", authorizationCode);
        reqparm.Add("redirect_uri", HttpUtility.UrlEncode(returnUrl.AbsoluteUri));

        try
        {
            using (WebClient client = new WebClient())
            {
                var data = client.UploadValues(TokenEndpoint, "POST", reqparm); // Access Denied exception occurs here.
                ...

这是我收到的回复:

HEADER
{
Pragma: no-cache
Vary: Accept-Encoding
Connection: close
Content-Length: 72
Cache-Control: no-store
Content-Type: application/json
    Date: Mon, 10 Jun 2013 23:35:02 GMT
    Server: Apache-Coyote/1.1
}
Content
text    
{   
    \"error_description\":\"Unable to generate token\",
    \"error\":\"access_denied\"
}"
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