HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/offlinefacemch/organizations/888/users/user-id/555/terminate-contract");
httpPost.setHeader("Accept", "application/json");
CloseableHttpResponse response = wxPayClient.execute(httpPost);
try {
    int statusCode = response.getStatusLine().getStatusCode();//响应状态码
    if (statusCode == 200||statusCode==204) {
 //解除签约成功
    } else {
 log.info("解除学生签约关系失败, 返回结果 ,响应码 = " + statusCode);
    }
} catch (Exception e) {
    log.info("解除学生签约关系失败:{}", e);
    throw new Exception("解除学生签约关系失败");
} finally {
    response.close();
}

用的官方的库，其他接口就可以，有实际业务在运行，就这个接口不行，是不是要你们那边审核啊

日志:
java.lang.IllegalArgumentException: Entity may not be null
 at org.apache.http.util.Args.notNull(Args.java:54)
 at org.apache.http.util.EntityUtils.toString(EntityUtils.java:254)
 at com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials.buildMessage(WechatPay2Credentials.java:85)
 at com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials.getToken(WechatPay2Credentials.java:58)
 at com.wechat.pay.contrib.apache.httpclient.SignatureExec.executeWithSignature(SignatureExec.java:83)
 at com.wechat.pay.contrib.apache.httpclient.SignatureExec.execute(SignatureExec.java:61)
 at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
 at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
 at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)

有可能是那个userid的问题，谢谢。